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Uncle Zhang of the Great Wall Automobile Factory has 300 parts in his five-piece suit. How many people are there in two hours?

Solution: Assume that there are X parts after 2 hours of reassembly.

5:(5+2)=300:x

5:7=300:x

5x=7×300

5x=2 100

x=2 100÷5

x=420

A: There are 420 parts in 2 hours.