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Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 63, then difference of first and third numbers is:

A27

B54

C108

D90

Answer:

B. 54

Read Explanation:

Let the second number be x first number = 2x third number = 4x (2x + x +4x)/3 = 63 ⇒ 7x =189 ⇒ x = 27 Thus, the numbers are 54, 27 and 108 The difference of first and third number = 108 – 54 = 54


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