The average of 25 results is 18. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13th result?

A. 74

B. 75

C. 69

D. 78

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Answer-D
Solution-

Solution(By Apex Team)


Sum of 1st 12 results = 12 × 14 Sum of last 12 results = 12 × 17 13th result = x (let) Now, 12 × 14 + 12 × 17 + x = 25 × 18 Or, x = 78

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