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Eight weekly math exams
Solution: (1) On Monday, the product quantity of two workshops for two days was 2b×2=4b.

The original 2a, and then check (2a+4b) in two days and A+2B in one day;

(2) According to the meaning of the question, 2(a+2b)2=2(a+5b)3.

The solution is a = 4b.

(3)2(a+2b)2÷45b=5(a+2b)4=7.5。

The quality inspection department should send at least 8 inspectors.