Question discussion

The average of 11 results is 50. The average of the first six results is 49 and that of the last six is 52. What is the sixth result?

Correct answer: C

Explanation

The sixth result is counted twice in the two groups, so it equals 6 × 49 + 6 × 52 − 11 × 50 = 294 + 312 − 550 = 56.

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