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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?

40
126
69
195

Correct Answer: 40

Explanation:

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
∴ 4_th number = 40

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