Out of four numbers, the average of the first three numbers is thrice the fourth number. If the average of the four numbers is 5, the fourth number is: (A) 4.5 (B) 5 (C) 2 (D) 4

Out of four numbers, the average of the first three numbers is thrice the fourth number. If the average of the four numbers is 5, the fourth number is: (A) 4.5 (B) 5 (C) 2 (D) 4
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1 Answer

Answer :

(C) 2 

Answer: C
Give that average of the four numbers is 5.
So addition of 4 numbers is 20.
The average of the first three numbers is thrice the fourth number
So 6 + 6 + 6 =18.
Hence fourth is 20- 18 =2.
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