(x-45)/(x-24)=62.5%,怎么算

题目

(x-45)/(x-24)=62.5%,怎么算

答案

两边乘以x-24
x-45=0.625(x-24)
x-45=0.625x-15
x-0.625x=45-15
0.375x=30
x=30÷0.375
x=80