0.48/9.8=16/x
1/20=16/x
x=20*×16
x=320
7:x=4.8:9.6
7:x=1∶2
x=7×2
x=14
x:3/4=12:1/8
1/8x=12×3/4
1/8x=9
x=9×8
x=72 0.48/9.8=16/x
1/20=16/x
x=20*×16
x=320
7:x=4.8:9.6
7:x=1∶2
x=7×2
x=14
x:3/4=12:1/8
1/8x=12×3/4
1/8x=9
x=9×8
x=72