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Five numbers average 7. After three more numbers are added, the average of all eight becomes 8.5. What is the average of the three newly added numbers?

1. 9
2. 10.5
3. 11
4. 11.5

Correct answer: 11

Solution

The eight numbers total 68 and the original five total 35, so the three new numbers sum to 33, giving an average of 11.

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