1. Clothing factory plans to produce 600 sets of sportswear every day, and finish the task in 20 days, and actually finish the task 15 days. How many sets are actually produced every day? Proportional solution (1) Set the actual production of X units per day.

Because the total number is the same, so 600*20= 15*X, X=800, so 800 sets are actually produced every day.

(2) If the construction period is reduced by 2 days, it will be completed in 10 day.

Let's have x people, because the total amount remains the same,

So 25* 12= 10X, X=30, so 30 people are needed.

(3) Now the number of watches per person is 1.5, so now the number of watches per person is 60.

Suppose x people are needed now, because the total number remains the same.

So we get 40* 18=60*X, and X= 12, so we subtract 18- 12=6 (person).