Question

英语奥数~

1. a club has 480 members.60%of the members are mem and the rest are woman. if the number of male members is increased by 25%,what is the new percentage of female members?

2. in a test there were 80 questions. limin answered 92.5%of the questions and she got 75% correct on all the questions she answered.what is her makes in percentage?

3. nigel paid $26 for a pen when it was sold at a discount of 20%.kimberly bought the smae type of pen at $26.65.what percentage discount did kimberly get?
2楼真是对不起~因为你没有翻译~~~~~~~~~

Answer 1

1.一个俱乐部有480名成员,60%是男人,其余的是女人.如果男人数量增加25%,女人所占百分比是多少?
原来男人有480*60%=288(人)
原来女人有480-288192(人)
男人增加后有288*(1+25%)=360(人)
男人增加后俱乐部有192+360=552(人)
女人所占百分比192/552=0.34786约=34.8%
2. 一次比赛有80道题,李民回答了92.5%的问题,她的正确率有75%,她总的正确分用百分比表示为80*92.5%*75%=55.5%
3. nigel为一只笔付了$26,那只笔是有20%的优惠卖给她的.kimberly为那一只笔付了$26.65,kimberly享受了%的优惠?
笔原价26/(1-20%)=$32.5
优惠(32.5-26.65)/32.5=0.18=18%

Answer 2

1. 现在男会员人数增加了25%，也就是85%了，那女会员就只有15%了。

2。她答了92.5%的题，答对了75%，所以她的分数是80 X 92.5% X 75% = 55.50%

3. $26是打了八折以后的价，所以原价是$32.5

那么 $26.65 / $32.5 = 82% 他的折扣是 18%

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