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The average of nine number is 50. The average of first five numbers is 54 and that of the last three numbers is 52. Then the sixth number is :

A. 30 B. 34 C. 24 D. 44 Answer: Option C
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Solution(By Apex Team)

Average of 9 numbers = 50 Hence sum of 9 numbers = 450 Average of last three numbers = 52 Hence sum of them will be = 156 Average of first five numbers is = 54 Hence sum of them will be = 54 × 5 = 270 So 6th number will be = sum of 9 numbers – (sum of first five numbers + sum of last three numbers) = 450 – (156 + 270) = 24

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