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Math problem: a project plan needs 40 people 15 days to complete. Now, how many people do you need to finish it in 12 days?
Analysis:

(1) If 1 person completes 1 project in 0 days, then the project is planned to be completed by 40 people in 15 days, and it can be found that there are 40 * * 15 = 600 projects.

(2) If we need to finish the project within 12 days and need to do 600/ 12=50 (copies) every day, then we need to increase 50-40= 10 (people).