一根铁丝,截去它的40%,还剩下36m.如果截去它的75%,还剩下多少米?
问题描述:
一根铁丝,截去它的40%,还剩下36m.如果截去它的75%,还剩下多少米?
答
设这跟铁丝原来长度为x米
则依题意得:
40% x =36
求得 X = 90
再 ( 1 - 75% ) X = 25% * 90 = 22.5m