仓库先后运来两批粮食,如果只有第一批增加20%
- 时间:2020-05-14 13:29:37
- 分类:数学世界
- 阅读:132 次
数学题:仓库先后运来两批粮食,如果只有第一批增加20%,则两批粮食共运146吨;如果只有第二批减少20%,则两批共运120吨,这两批粮食实际一共运多少吨?
数学题解答:此题用方程来解相对容易些。
解:设第一批增加20%后的重量为X吨,则第二批可表示为(146-X)吨,第一批原来的可表示为:(X÷ 120%)吨。
再根据“如果只有第二批减少20%,则两批共运120吨”可列出方程:
X÷ 120% + (146-X)×(1-20%)= 120
X=96
第一批:96÷ 120%=80(吨)
第二批:146-96=50(吨)
一共:80+50=130(吨)
答:这两批粮食实际一共运130吨。
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