24x 2/3x 1/2÷8/9 = 9 18 x2/3÷3/7 = 28

1、2+3+4 = 9 5.94 x2/9 = 5.94 x3/9 = 5.94 x4/9 =

2 、( 15.4+20)÷( 1- 1/3)x 1/3

3、 15÷3/ 10=50 50- 15=

4 、( 1- 1/4-2/5)X = 14

5. let b be x.

(4/5X+6):(X-6)=5:4

6、 15%x400÷8%-400

7. let a be x, then b is 20%X=0.2X,

X+0.2X= 18 X= 15, so the number a is 15 and the number b is 15x0.2=3.

8、75÷ 1200=0.0625=6.25%

9.500x (1-60%) = 200m.

Foreign languages are my weakness. The following answers are for reference only:

What's the point of inviting sandwiches and bread to take photos and go shopping?