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 ?



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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