40%:20等于X:

问题描述:

40%:20等于X:

40%=0.4
20X=6
X=0.3

40%:20=X:15
20x=40%*15
20x=6
x=0.3

40% :20 = x :15
20x = 15×40%
20x = 6
x = 6÷20
x = 0.3