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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
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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