decreasing 75by x percent give the same result as increasing

问题描述:

decreasing 75by x percent give the same result as increasing 45 byx precent,what is the
1个回答 分类:英语 2014-11-06

问题解答:

我来补答
75(1-x%)=45(1+x%)
75-45=(45+75)x%
30=120x%
x%=30/120=1/4=25%
x=25
 
 
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