Out of 4 numbers, whose average is 60, the first one is one fourth of the sum of

Question

Out of 4 numbers, whose average is 60, the first one is one fourth of the sum of the last three. The first number is

Options:

A . 48

B . 60

C . 15

D . 45

Answer: Option A
Answer: (a)Let the first number be x, then, x = ${240 - x}/4$⇒ 4x = 240 – x ⇒ 5x = 240 ⇒ x = $240/5$ = 48

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