The first problem is that there is 10 black in the first box, accounting for 2/5 of the total. So divide 10 by 2/5 to get 25 pieces in a box. 10 black, 15 white. Because there are as many chocolate bars in the second box of dark chocolate as in the third box of white chocolate. Then the second box of white chocolate has as many pieces as the third box of dark chocolate. In short, the second box of white chocolate plus the third box of white chocolate is exactly equal to a box of cooked chocolate, which is 25 pieces. So a * * * has 15+25=40 pieces.

The second problem is that men are less than women by 4% 1. Painting can get 3% for men and women * * * 7 points for men and women, 140 divided by 7 equals 20. Male accounts for 3. 3 times 20 equals 60 people. Four women, four times 20 equals 80.