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The average of 12 numbers is 15 and the average of the first two is 14. What is the average of the remaining numbers?

1. 15
2. 15.2
3. 14
4. 14.5

Correct answer: 15.2

Solution

The total of 12 numbers is 12 × 15 = 180. The first two numbers total 2 × 14 = 28, so the remaining 10 numbers total 180 - 28 = 152. Their average is 152/10 = 15.2.

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