Quantitative Aptitude • Ratio, Average & MixtureHard
The average of 11 results is 53. The average of the first 6 results is 49 and the average of the last 6 results is 59. What is the 6th result?
A. 65✓ Correct Answer
B. 118
C. 53
D. 54
💡 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 × 49 = 294; sum of the last 6 = 6 × 59 = 354; sum of all 11 = 11 × 53 = 583. So the 6th result = 294 + 354 − 583 = 65.
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