2，26/5 * 5/4 = 6.5m。

26/5*6.5=33.8 square meters

3、 1+3/20=23/20

1472 ÷ 23/20 =12.8 million yuan

4、 108÷3/2=72

72*8/9=64 cases

5，20/3 * 1/2 = 10/3m

6、 1-4/7=3/7

2.4 Now 3/7 = 56,000 pieces.

7. Let the number of girls be x and the number of boys be y..

x/y=3/4

x+2/y=4/5

x=30，y=40

Class size: 30+2+40=72.

8、 1-3/ 10=7/ 10

3 1+5.4=36.4

36.4÷7/ 10=50 tons

9、 1/3- 1/5=2/ 15

34 \u 2/ 15 = 255 pages

10、42*4/7=24

24/6/ 1 1 = 44 people