Description : What is the smallest whole number that is equal to seven times the sum of its digits? -Riddles
Last Answer : The answer to this math riddle is 21. You probably just guessed to answer this math riddle, which is fine, but you can also work it out algebraically. The two-digit number ab stands for 10a + b since the ... a = 2b. That is, the second digit must be twice the first. The smallest such number is 21.