1.一根电线长160米,剪去全长的百分之75.还剩多少米?

问题描述:

1.一根电线长160米,剪去全长的百分之75.还剩多少米?
2.一根电线,剪去全长的百分之75,还剩40米.原电线长多少米?

1、还剩:160×(1-75%)=40米
2、原来长:40÷(1-75%)=160米