The sum of seven numbers is 235. The average of the first three is 23 and that of the last three is 42. The fourth number is?

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Accepted Answer

Sum of 7 numbers = sum of first 3 numbers + N4 + sum of last 3 numbers. (23 x 3) + N4 + (42 x 3) = 235 ⇒ N4 = 40 ∴ 4th number = 40

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