3:8= 15:x x=40

x:9=4:3 x= 12

1/4: 1/8 = x: 1/ 10 x = 1/5

1.25:0.25=x: 1.6 x=8

3/4:x=3: 12 x=3

5:8=40:x x=64

x:3/4= 1/5:2/5 x=3/8

140:2=x:5 x=350

6.5:x=3.25:4 x=8X:20=0.4:6

6X=20*0.4

X=4/3

45:9=x:3

32:4=X:8

38:60=x:30

25:40=x:60

1 1:50=x: 100

18:25=x:75

85: 1664=x:6 124

14%:X=4.75:57/8