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Q. 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
Explanation by: Parvesh Kanani
Given , Sum of first 3 numbers = 15 × 3 = 45 ⇒ a + b + c = 45 , last number = d = 19 and Sum of the last three numbers = 16 × 3 = 48 ⇒ b + c + d = 48 ⇒ b + c = 48 – 19 = 29 ∴ a + b + c = 45 ⇒ a = 45 – 29 = 16
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