5/7(3x-30)=x+30

15x/7- 150/7=x+30

15x- 150 = 7x+2 10

8x=360 x=45 135

24+ 15=39 12*39/3= 166

15- 12=3

153

Apples and peaches x and 2x

x-0.2x- 18 = 4/ 15(2x-0.5x- 12)

x=37

Apple 37, peach 74

A When working alone, the actual work104/7 =14+6 =14 * 6+6 = 90 days, and the efficiency is 1/90.

B When working alone, the actual working time is 82/7= 1 1+5 =1* 5+5 = 60 days, and the efficiency is 1/60.

Take a week as a cycle. With the cooperation of two teams, the progress of a week is 6/90+5/60=3/20. The next discussion is that after six weeks, 9/ 10 6*7=42 (days) is completed, leaving1102 teams to work together. The number of days spent is (65438+.

The total time is 42+4=46 days.

No 12 of August 2008