Quantitative Aptitude • Ratio, Average & MixtureHard
The average of 11 results is 56. The average of the first 6 results is 62 and the average of the last 6 results is 53. What is the 6th result?
A. 56
B. 57.5
C. 74✓ Correct Answer
D. 130
💡 Solution & Explanation
The first 6 and the last 6 results together make 12 results, but there are only 11: the 6th result is counted in both groups. Sum of the first 6 = 6 × 62 = 372; sum of the last 6 = 6 × 53 = 318; sum of all 11 = 11 × 56 = 616. So the 6th result = 372 + 318 − 616 = 74.
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