Question

解比例 2/8=9/x 1/2:1/5=1/4:x 1.25/0.25=x/1.6 40:x=2.5:15 1/2:x=

Answer 1

2/8=9/x

2x=72

x=36

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

1/5 X 1/4=1/2 X x

1/2x=1/20

x=1/10

1.25/0.25=x/1.6

0.25x=1.25 X 1.6

0.25x=2

x=8

40:x=2.5:15

2.5x=40X15

2.5x=600

x=240

1/2:x=5:16

0.5:x=5:16

5x=16X0.5

5x=8

x=1.6

3/4:1/5=20:x

3/4x=1/5 X 20

3/4 x=4

x=4 X 4/3

x=16/3