I am a three-digit number. All of my digits are prime. One of the numbers is even. Each of my numbers are used only once. The total of my first and last digits equals 10. The total of my first two digits equals 5. -Riddles

I am a three-digit number. All of my digits are prime. One of the numbers is even. Each of my numbers are used only once. The total of my first and last digits equals 10. The total of my first two digits equals 5. -Riddles
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Answer :

This one is fairly easy if you use elimination if you follow all the first 5 steps you get three options: 525, 327, and 723 but if you followed the last step you would reach your answer. The answer was 327.
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I am a two-digit number. All my digits are even. No two digits are the same. None of my digits are prime numbers. I am not a multiple of ten. My tens digit is bigger than my other numbers. If you followed all the previous steps, there should be three options remaining the number is the option where if you add all the digits it’s exactly in the middle (in how big the number is) of all the other options with their digits added together. What number am I? -Riddles

Description : I am a two-digit number. All my digits are even. No two digits are the same. None of my digits are prime numbers. I am not a multiple of ten. My tens digit is bigger than my other numbers. ... big the number is) of all the other options with their digits added together. What number am I? -Riddles

Last Answer : If you followed all the steps apart from the last one there will be three options remaining: 64, 84, and 86. You then had to add up the digits, 64=6+4=10, 84=8+4=12, and 86=8+6=14. ... biggest number (12) and put it back as it was before the digits were added together and your answer should be 84.

A certain number has three digits. The sum of the three digits equals 36 times this number. Seven times the left digit plus 9 is equal to 5 times the sum of the two other digits. 8 times the second digit minus 9 is equal to the sum of the first and third.What is the number? -Riddles

Description : A certain number has three digits. The sum of the three digits equals 36 times this number. Seven times the left digit plus 9 is equal to 5 times the sum of the two other digits. 8 times the second digit minus 9 is equal to the sum of the first and third.What is the number? -Riddles

Last Answer : This one is fairly easy - 324 is the answer.

What two-digit number equals two times the result of multiplying its digits? -Riddles

Description : What two-digit number equals two times the result of multiplying its digits? -Riddles

Last Answer : 36 = 2 x 3 x 6.

I am a five-digit whole number, read the same forward, backward and upside down. My second digit is half my third digit; my fifth digit is the product of my first and last digits; and the sum of my whole is ten. What am I? -Riddles

Description : I am a five-digit whole number, read the same forward, backward and upside down. My second digit is half my third digit; my fifth digit is the product of my first and last digits; and the sum of my whole is ten. What am I? -Riddles

Last Answer : 10801

What four digit positive, whole number has its last and first digits equal, addition of its last two digits is equal to its second digit. And the product of the squares of its last two digits is equal to four two noughts. -Riddles

Description : What four digit positive, whole number has its last and first digits equal, addition of its last two digits is equal to its second digit. And the product of the squares of its last two digits is equal to four two noughts. -Riddles

Last Answer : 5945. 5=5. 4+5=9=second digit 4^2 x 5^2 = 400 = four two noughts

What is the 4 digit number in which the first digit is one-fifth of the last, and the second and third digits are the last digit multiplied by 3? -Riddles

Description : What is the 4 digit number in which the first digit is one-fifth of the last, and the second and third digits are the last digit multiplied by 3? -Riddles

Last Answer : 1155

10.) A two-digit number is prime. When you reverse the digits, that number is also prime. What could the number be List three possibilities.?

Description : 10.) A two-digit number is prime. When you reverse the digits, that number is also prime. What could the number be List three possibilities.?

Last Answer : Some numbers that you can get when you reverse the digits and they are still prime numbers are: 403 ÷ 13 = 31 2,701 ÷ 37 = 73 1,207 ÷ 17 = 71

10.) A two-digit number is prime. When you reverse the digits, that number is also prime. What could the number be List three possibilities.?

Description : 10.) A two-digit number is prime. When you reverse the digits, that number is also prime. What could the number be List three possibilities.?

Last Answer : Some numbers that you can get when you reverse the digits and they are still prime numbers are: 403 ÷ 13 = 31 2,701 ÷ 37 = 73 1,207 ÷ 17 = 71

If there are n integers to sort, each integer has d digits and each digit is in the set {1,2, ..., k}, radix sort can sort the numbers in: (A) O(d n k) (B) O(d nk) (C) O((d+n)k) (D) O(d(n+k))

Description : If there are n integers to sort, each integer has d digits and each digit is in the set {1,2, ..., k}, radix sort can sort the numbers in: (A) O(d n k) (B) O(d nk) (C) O((d+n)k) (D) O(d(n+k))

Last Answer : (D) O(d(n+k))

0,1,2,3,4,5,6,7,8,9 Use the digits above once each only to compose two fractions which when added togeather equal 1. -Riddles

Description : 0,1,2,3,4,5,6,7,8,9 Use the digits above once each only to compose two fractions which when added togeather equal 1. -Riddles

Last Answer : 35/70 + 148/296 = 1

How many 7-digit numbers can be formed using the digits 1 2 3 4 and 8?

Description : How many 7-digit numbers can be formed using the digits 1 2 3 4 and 8?

Last Answer : What is the answer ?

How many 3-digit numbers are there in which the product of those 3 digits is 9?

Description : How many 3-digit numbers are there in which the product of those 3 digits is 9?

Last Answer : 119, 191, 911, 331, 313, 133

What is the formula for the quiz-What is the 4 digit number in which the first digit is one-fifth of the last and the second and third digits are the last digit multiplied by 3?

Description : What is the formula for the quiz-What is the 4 digit number in which the first digit is one-fifth of the last and the second and third digits are the last digit multiplied by 3?

Last Answer : Need answer

How did you arrive at the answer of 1155 for What is the 4 digit number in which the first digit is one-fifth of the last and the second and third digits are the last digit multiplied by 3?

Description : How did you arrive at the answer of 1155 for What is the 4 digit number in which the first digit is one-fifth of the last and the second and third digits are the last digit multiplied by 3?

Last Answer : There are only two single-digit numbers where one is 1/5 of theother. Those are 1 and 5 and they become the outside numbers. Fromthere, it's relatively easy to multiply 5 by 3 to get 15 for theinside numbers.

I forgot the last digit of a 7-digit telephone number. If I randomly dial the final 3 digits after correctly dialing the first four, then what is the chance of dialing the correct number? a) 1/1001 b) 1/1000 c) 1/999 d) 1/990

Description : I forgot the last digit of a 7-digit telephone number. If I randomly dial the final 3 digits after correctly dialing the first four, then what is the chance of dialing the correct number? a) 1/1001 b) 1/1000 c) 1/999 d) 1/990

Last Answer : b) 1/1000

When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs of numbers each adding to 101. 50 X 101=5,050.Now find the sum of all the digits in integers from 1 through 1,000,000,000.That's all the digits in all the numbers, not all the numbers themselves. -Riddles

Description : When the celebrated German mathematician Karl Friedrich Gauss (1777-1855) was nine he was asked to add all the integers from 1 through 100. He quickly added 1 to 100, 2 to 99, and so on for 50 pairs ... 1,000,000,000.That's all the digits in all the numbers, not all the numbers themselves. -Riddles

Last Answer : The numbers can be grouped by pairs: 999,999,999 and 0; 999,999,998 and 1' 999,999,997 and 2; and so on.... There are half a billion pairs, and the sum of the digits in each pair is 81. The digits in the unpaired number, 1,000,000,000, add to 1. Then: (500,000,000 X 81) + 1= 40,500,000,001.

In an examination mahi scores 64% of marks, nitesh scores 52% of marks and ritesh scores 48% of marks. The maximum mark of the exam is a three digit number, whose sum is 10 and the middle digit is equal to the sum of the other two digits. The number will decreased by 297, if its digit are reversed. approximately what is the average mark obtained by mahi, nitesh and ritesh? A) 247 B) 248 C) 264 D) 284

Description : In an examination mahi scores 64% of marks, nitesh scores 52% of marks and ritesh scores 48% of marks. The maximum mark of the exam is a three digit number, whose sum is 10 and the middle digit is equal to ... what is the average mark obtained by mahi, nitesh and ritesh? A) 247 B) 248 C) 264 D) 284

Last Answer : A) Maximum mark consist of a three digit number let's consider Unit digit place is Z,ten's place digit is Y and hundred's place digit is X. According to the question, Y=x+z---------1 X+Y ... Total number of Mahi, Nitesh and Ritesh =164/100 451=739.61 Required average =739.64/3=246.54~247.

In the multiplication below each letter represents a different digit and only the digits 1 2 3 4 5 are used. Which of the letters represents 2?

Description : In the multiplication below each letter represents a different digit and only the digits 1 2 3 4 5 are used. Which of the letters represents 2?

Last Answer : E

What is the greatest six digit odd number using three different digits only?

Description : What is the greatest six digit odd number using three different digits only?

Last Answer : In this type of question, you need to fill out the largest digityou can, one at a time, from left to right. The largest digit youcan use for the leftmost position, is 9, the largest digit ... :999999(if you want AT MOST three different digits), or999987 (if you want EXACTLY three different digits).

What two-digit numbers are each equal to their right-most digit squared? -Riddles

Description : What two-digit numbers are each equal to their right-most digit squared? -Riddles

Last Answer : 25 = 5² and 36 = 6².

In a two-digit number, the sum of the digit is 5 more than the units digit. The difference between the original number and the sum of digits is 10 mor

Description : In a two-digit number, the sum of the digit is 5 more than the units digit. The difference between the original number and the sum of digits is 10 mor

Last Answer : In a two-digit number, the sum of the digit is 5 more than the units digit. The ... the digits. Then find the difference between the digits.

How many different 4 digit combinations are there for numbers 1 2 3 (assuming all three numbers are used and no numbers can be repeated more than once) (For example, 1233 is acceptable, but 1133 is not.)?

Description : How many different 4 digit combinations are there for numbers 1 2 3 (assuming all three numbers are used and no numbers can be repeated more than once) (For example, 1233 is acceptable, but 1133 is not.)?

Last Answer : NOT AN ANSWER:More acceptable combinations:1231 3213 2321More unacceptable combinations:1112 2222 3113Thanks.

A student was once given a simple task to accomplish. He was given 6 numbers: 1, 10, 20, 30, 40, and 80, and was told to sum them together to be equal to 100. At last, he was able to accomplish this task. How did he do it? -Riddles

Description : A student was once given a simple task to accomplish. He was given 6 numbers: 1, 10, 20, 30, 40, and 80, and was told to sum them together to be equal to 100. At last, he was able to accomplish this task. How did he do it? -Riddles

Last Answer : He read 10 and 80 backwards to give him 01 and 08 respectively. So, 1 + 01 + 20 + 30 + 40 + 08 = 100.

What is a number that has 2 digits less than 10 the tenths digit is one more than the ones digit nad the digits add up to 7?

Description : What is a number that has 2 digits less than 10 the tenths digit is one more than the ones digit nad the digits add up to 7?

Last Answer : 44

What is the least 4 digits prime numbers?

Description : What is the least 4 digits prime numbers?

Last Answer : Prime and composite numbers

The 2 digit number which becomes (5/6)th of itself when its digits are reversed. The difference in the digits of the number being 1, then the two digits number is (a) 45 (b) 54 (c) 36 (d) None of these

Description : The 2 digit number which becomes (5/6)th of itself when its digits are reversed. The difference in the digits of the number being 1, then the two digits number is (a) 45 (b) 54 (c) 36 (d) None of these

Last Answer : (b) 54

The 2 digit number which becomes (5/6)th of itself when its digits are reversed. The difference in the digits of the number being 1, then the two digits number is (a) 45 (b) 54 (c) 36 (d) None of these

Description : The 2 digit number which becomes (5/6)th of itself when its digits are reversed. The difference in the digits of the number being 1, then the two digits number is (a) 45 (b) 54 (c) 36 (d) None of these

Last Answer : (b) 54

If the digits of a two digit number are interchanged, the number formed is greater than the original number by 45. If the difference between the digits is 5.What is the original number?

Description : If the digits of a two digit number are interchanged, the number formed is greater than the original number by 45. If the difference between the digits is 5.What is the original number? a) 18 b) 25 c) 36 d) Cannot be determined e) None of these

Last Answer : According to question both statements gives some equation which have two variable and it is not possible to find out two variable by single eg. Answer: d)

A two digit number is such that the sum of the digits is 11.When the number with the same digits is reversed is subtracted from this number, the difference is 9.What is the number? 1. 23 2. 24 3. 65 4. 14 5. 32

Description : A two digit number is such that the sum of the digits is 11.When the number with the same digits is reversed is  subtracted from this number, the difference is 9.What is the number? 1. 23 2. 24 3. 65 4. 14 5. 32

Last Answer : Answer- 3(65) Explanation:- let the number be written as xy x-ten’s place y units place x+y=11…………………1 (10x+y)-(10y+x)=9 10x+y-10y-x=9 9x-9y=9 x-y=1………………….2 Add (1) & (2) 2x=12 x=6 y=5 the number is 65

The digits of a two-digit number are in the ratio of 2 : 3 and the number obtained by interchanging the digits is bigger than the original number by 27.What is the original number? 1. 63 2. 48 3. 96 4. 69 5. 66

Description : The digits of a two-digit number are in the ratio of 2 : 3 and the number obtained by interchanging the digits is bigger than the original number by 27.What is the original number? 1. 63 2. 48 3. 96 4. 69 5. 66

Last Answer : Answer- 4 (69) Explanation:- lets digit at tens and ones place be 2x and 3x So,number is 2x*10 + 3x After interchanging number will be 3x*10 +2x so, [3x*10 +2x] – [2x*10 + 3x]27 we get,x=3 so number =69

I am a three digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I? -Riddles

Description : I am a three digit number. My tens digit is five more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I? -Riddles

Last Answer : Number 194.

How many two digit prime numbers end in the digit 3?

Description : How many two digit prime numbers end in the digit 3?

Last Answer : 13, 23, 43, 53, 73 & 83

What two whole, positive numbers that have a one-digit answer when multiplied and a two-digit answer when added? -Riddles

Description : What two whole, positive numbers that have a one-digit answer when multiplied and a two-digit answer when added? -Riddles

Last Answer : 1 and 9.

Jenna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3? -Riddles

Description : Jenna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3? -Riddles

Last Answer : Jenna wrote it 120 times.

Number of digits in the cube of a two digit number may be ____________

Description : Number of digits in the cube of a two digit number may be ____________

Last Answer : Number of digits in the cube of a two digit number may be ____________

In a two-digit number, the sum of the digits is 9. If 9 is subtracted from the number, then the digits get reversed. Find the product of the digits

Description : In a two-digit number, the sum of the digits is 9. If 9 is subtracted from the number, then the digits get reversed. Find the product of the digits

Last Answer : In a two-digit number, the sum of the digits is 9. If 9 is subtracted from the number, then the digits get reversed. Find the product of the digits

In a two-digit number, the ten digit is one more than twice the units digit. The sum of the digits is 36 less than the number formed by reversing the

Description : In a two-digit number, the ten digit is one more than twice the units digit. The sum of the digits is 36 less than the number formed by reversing the

Last Answer : In a two-digit number, the ten digit is one more than twice the units digit. The sum of ... by reversing the digits. Find the product of the digits

What is a two digit number whose sum of those digits is the square root of that number?

Description : What is a two digit number whose sum of those digits is the square root of that number?

Last Answer : The number is 81.

If the positions of the digits of a two digit number are interchanged, the number obtained is smaller than the original number by 27. If the digits of the number are in the ratio of 1 : 2, what is the original number ? a) 25 b) 81 c) 36 d) Cannot be determined e) None of these

Description : If the positions of the digits of a two digit number are interchanged, the number obtained is smaller than the original number by 27. If the digits of the number are in the ratio of 1 : 2, what is the original number ? a) 25 b) 81 c) 36 d) Cannot be determined e) None of these

Last Answer : Cannot be determined Answer: d)

The square of a two digit number is divided by half the number. After 36 is added to the quotient, this sum is then divided by 2. The digits of the resulting number are the same as those in the original number, but they are in reverse order. The ten's place of the original number is equal to twice the difference between its digits. What is the number?

Description : The square of a two digit number is divided by half the number. After 36 is added to the quotient, this sum is then divided by 2. The digits of the resulting number are the same as those in ... 's place of the original number is equal to twice the difference between its digits. What is the number?

Last Answer : Answer: 46

Write the given sets in roster form: (a). P = {y: y is an integer and -4 < y < 6}. (b). Q = {y: y is a natural number which is <8} (c). R = {y: y is a 2 digit natural number in which the sum of its digits is 9} -Other

Description : Write the given sets in roster form: (a). P = {y: y is an integer and -4 < y < 6}. (b). Q = {y: y is a natural number which is

Last Answer : (i) A = {x: x is an integer and †3 < x < 7} The elements of this set are †2, †1, 0, 1, 2, 3, 4, 5, and 6 only. Therefore, the given set can be written in roster form as A = {†2, †... and 80 only. Therefore, this set can be written in roster form as C = {17, 26, 35, 44, 53, 62, 71, 80}}.

A five digit number is formed by the digits 0, 1, 2, 3, 4 (without repetition). Find the probability that the number formed is divisible by 4 ? -Maths 9th

Description : A five digit number is formed by the digits 0, 1, 2, 3, 4 (without repetition). Find the probability that the number formed is divisible by 4 ? -Maths 9th

Last Answer : Without repetition, a five -digit number can be formed using the five digits in 5! ways (5 4 3 2 1) Out of these 5! numbers, 4! numbers will be starting with digit 0. (0 (fixed) 4 3 2 1) ∴ Total ... + 6 + 6 + 4 + 4 + 4 = 30∴ Required probability = \(rac{30}{96}\) = \(rac{5}{16}.\)

A four digit number is formed by the digits 1, 2, 3, 4 with no repetition. The probability that the number is odd is -Maths 9th

Description : A four digit number is formed by the digits 1, 2, 3, 4 with no repetition. The probability that the number is odd is -Maths 9th

Last Answer : (a) \(rac{1}{2}\) Let S be the sample spaceThen n(S) = Number of four digit numbers that can be formed with out repetition1 of 4 digits1 of 3 digits1 of 2 digits1 of 1 digitThHTO= 4! = 4 3 2 1 ways = 24 ways. Let E : ... 1 = 12∴ P(E) = \(rac{n(E)}{n(S)}\) = \(rac{12}{24}\) = \(rac{1}{2}\).

The units digit of the square of a number and the units digits of the cube of the number are equal to the units digits of the number .How many values

Description : The units digit of the square of a number and the units digits of the cube of the number are equal to the units digits of the number .How many values

Last Answer : The units digit of the square of a number and the units digits of the cube of the number are equal to the units ... such number? A. 2 B. 3 C. 4 D. 5

The units digit of the square of a number and the units digits of the cube of the number are equal to the units digits of the number .How many values

Description : The units digit of the square of a number and the units digits of the cube of the number are equal to the units digits of the number .How many values

Last Answer : The units digit of the square of a number and the units digits of the cube of the number are equal to the units ... such number? A. 2 B. 4 C. 5 D. 3

What number is a 3 digit square number with the product of its digits equal to 2?

Description : What number is a 3 digit square number with the product of its digits equal to 2?

Last Answer : 121

What is the largest 3-digit odd number that can be formed using the digits 215 and 6?

Description : What is the largest 3-digit odd number that can be formed using the digits 215 and 6?

Last Answer : 651

The average of the 3 digit number, which remain the same when the digits interchange their positions is. A) 444 B) 555 C) 666 D) 777

Description : The average of the 3 digit number, which remain the same when the digits interchange their positions is. A) 444 B) 555 C) 666 D) 777 

Last Answer : B) Average = (111+222+333+444+555+666+ 777+888+999)/9 =(111+999)+(222+888)+ (333+777)+(444+666)+ 555/9 =(4*1110)+555/9 =4440 + 555/9 =4995/9 =555.

Find the four digit number in which the first digit is one fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3. What is it? -Riddles

Description : Find the four digit number in which the first digit is one fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3. What is it? -Riddles

Last Answer : 1694