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I did 4 1 hour math problems and worked overtime for 9 hours, totaling 357 yuan. How much is an hour, and how much is overtime?
Suppose: usually it is X yuan an hour, and overtime is 2x yuan an hour.

Solution: 4 1-9=32

32×x = 357 x≈ 1 1. 1

9×2x=357

2x=39.7

x= 19.85

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