OG数学题求教，有没有可能是OG答案错了？

lxyidk · 发表于 2011-12-7 18:11:34

Mary's income is 60 percent more than Tim's income, and Tim's income is 40 percent less than Juan's income.What percent of Juan's income is Mary's income?

A124%
B120%
C96%
D80%
E60%
解题思路没有问题，设T收入1，M为1.6，J为1÷0.6，所以J比M应该是1÷0.6÷1.6=105%，无答案
OG答案为M=1.6*0.6J，Mary's income is 96 percent of J's income，分析也没错，问题是，题干问What percent of Juan's is Mary's income?，而答案Mary's income is 96 percent of J's income，我晕了，J比M和M比J到底哪个比哪个，该怎么表达？是我理解错了题干么？

怡然yiran · 发表于 2011-12-7 18:19:05

应该设J为1吧~~~

yyviolin · 发表于 2012-8-25 19:15:58

What percent of Juan's income is Mary's
income?

moxa03 · 发表于 2012-8-25 22:22:13

What percent of Juan's income is Mary's income?
楼主，这句话的意思就是Mary's income is what percent of Juan's

tomatoshirt · 发表于 2012-8-25 22:38:24

Mary's income is 60 percent more than Tim's income ---> 1.6T = M

Tim's income is 40 percent less than Juan's income. ----> 5/3T = J

What percent of Juan's income is Mary's income ----> x%J = M ----> M/J =?

1.6T/(5/3)T = 0.96

或者你可以用数字算　（我个人觉得会快一点）

J = 100, T = 60, M = 96 ... 96/100 = 96%

tomatoshirt · 发表于 2012-8-25 22:42:08

Oh 对了如果你对解题有困难用这 --- is 是 = (等于）.... what 是 Y （未知）。。。。of 是 x (相成）

What percent of Juan's income is Mary's income --> Y (what %) * (of ) J = (is) M

OG数学题求教，有没有可能是OG答案错了？

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