急:提问一道GRE数学1.Mr.Jones sold two house for 80000 dollarseach.One house was sold at a 20 percent loss and the other at a 20 percentgain.What is the gain minus the loss?因为盈的房子原价比亏得房子原价低,所以盈与亏的差

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急:提问一道GRE数学
1.Mr.Jones sold two house for 80000 dollars
each.One house was sold at a 20 percent loss and the other at a 20 percent
gain.What is the gain minus the loss?
因为盈的房子原价比亏得房子原价低,所以盈与亏的差数为负数.前半句能看懂,后半句不理解,虽然盈的房子原价比亏得房子原价低,但毕竟未算出具体原价,所以不确定原价与80000的各自差值谁大谁小吧?

题目应该是这样的,Jones先生有两套房子,每套卖了80000美元.
一套亏了20%,另一套赚了20%,
问题是,盈利减去亏损的差值是多少.
盈利的,（1+0.2）x=80000
亏损的,（1-0.2）y=80000

翻译应该是Jones先生有2套房子，卖了80000美元。
其中一套房子亏了20%，另一套房子赚了20%，问他赚的减去亏的差值是多少？
虽然知道2套房子的总价，但是不知道其中一套房子的价格，所以差值算不出来。

盈利那套原价为y, 亏本那套原价为x
得
x-0.2x=80000 x=100000
y+0.2y=80000 y=66666.7
(y-x)*20%=-6666.66,,为负数

题目大意是两套房子都卖了8000，但是一套等于是赚了20%，即原价应该是80000/1.2也就是80000*（5/6）赚了80000*（1/6），第二套亏了20%，即原价应该是80000/0.8,也就是80000*1.25原价10w，也就是亏了20000，这样说明白了吗？都考GRE的人了不应该看不明白呀~一个赚了8w的六分之一，一个亏了8w的四分之一，所以亏得多嘛...

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题目大意是两套房子都卖了8000，但是一套等于是赚了20%，即原价应该是80000/1.2也就是80000*（5/6）赚了80000*（1/6），第二套亏了20%，即原价应该是80000/0.8,也就是80000*1.25原价10w，也就是亏了20000，这样说明白了吗？都考GRE的人了不应该看不明白呀~一个赚了8w的六分之一，一个亏了8w的四分之一，所以亏得多嘛

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