Question

0.6:百分之36=4/5:x4/x+3=0.5 (3.8-x):7=2/78:5+x/4=4:5

Answer 1

0.6:百分之36=4/5:x

0.6x=0.36×0.8

0.6x=0.288

x=0.48

4/x+3=0.5

4=0.5×(x+3)

0.5x+1.5=4

0.5x=4-1.5

0.5x=2.5

x=5

(3.8-x):7=2/7

3.8-x=2/7×7

3.8-x=2

2+x=3.8

x=3.8-2

x=1.8

8:5+x/4=4:5

(5+4/x)×4=8×5

20+x=40

x=40-20

x=20