Out of four numbers, the average of the first three is 15 and that of the last t

Question

Out of four numbers, the average of the first three is 15 and that of the last three is 16. If the last number is 19, the first is

Options:

A . 15

B . 18

C . 16

D . 19

Answer: Option C
Answer: (c)Using Rule 1, a + b + c = 45 and b + c + d = 48 ⇒ b + c = 48 – 19 = 29 ∴ a + b + c = 45 ⇒ a = 45 – 29 = 16

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