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The second volume of mathematics in the fourth grade of primary school has ABC three numbers. The average of A and B is 23.6, the average of B and C is 15, what is the average of A and C?
A+B=23.6×2=47.2，A=47.2-B，

B+C = 15× 2 = 30, C = 30-B, A-C = (47.2-b)-(30-b) = 17.2, that is, A is more than C17.2.

The average of A and C is 8.6 less than A or 8.6 more than C. ..

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