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Question

The teacher asks Bill to calculate a-b-c, but Bill mistakenly calculates a-(b-c) and gets an answer of 11. If the correct answer was 3, what is the value of a-b?

Accepted Answer

Instead of calculating a - b - c, Bill calculated a - b + c. Therefore, the value of a - b is simply the average of the two, making for 11+32 = 7.