The average of three numbers is 77. The first number is twice the second and the second number is twice the third. Find the first number ?

Answer : D. 132

The average of three numbers is 77. The first number is twice the second and the second number is twice the third. Find the first number ?

A. 33

B. 66

C. 77

D. 132

Answer : D. 132

Explanation :

Sum of the numbers = 3 × 77 = 231
Let third number be x
Then, second number = 2x
First number = 4x
x + 2x + 4x = 231
⇒x = 33
First number = 4x
x = 132

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