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The average of 12 results is 75. If the top two results are excluded, the average becomes 72. What is the average of the top two results?

1. 90
2. 84
3. 96
4. 99

Correct answer: 90

Solution

The total of 12 results is 12×75 = 900. After excluding the top two, the total of the remaining 10 results is 10×72 = 720. So the top two results sum to 180, and their average is 90.

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