The average of 11 results is 60. If the average of first six results is 58 and that of last six is 63, find the 6th result-

Answer: Option A

The average of 11 results = 60
The total of 11 results = 60 × 11 = 660
Average of first six results = 58
Average of last six results = 63
Total of first six results = 58 × 6 = 348
Total of last six results = 63 × 6 = 378
∴ Sixth result = Total of first and last sixth results = Total of 11 results
= (348 + 378) - 660
= 726 - 660
= 66