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Three answers to engineering mathematics
Everyone has a certain number of days to finish, so everyone's work efficiency will be improved.

That is, the unit 1 divided by the number of days they completed, then everyone's work efficiency is as follows: 1/20, 1/25,115.

When three people do it at the same time, their total efficiency is (1/20+1/25+115).

Reuse 47% of the completed project, divided by the total work efficiency, and get the number of days.

47%/( 1/20+ 1/25+ 1/ 15)=3

The principle is time = workload/work efficiency. The workload here is 47%, and the work efficiency is the sum of the work efficiency of three people.

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