作者scont ( )
看板GMAT
标题[问题] 一题数学
时间Mon Mar 23 23:31:44 2009
On a certain road,10 percent of the motorists exceed the posted speed limit
and receive speeding tickets,but 20 percent of the motorists who exceed the
posted speed limit do not receive speeding tickets.What percent of the
motorists on that road the posted speed limit?
(A)10.5%
(B)12.5%
(C)15%
(D)22%
(E)30%
ANS:(B)
感谢回答~
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 61.228.43.177
1F：推 hatepig:10%*the motorists = 80%*the motorists who exceed 03/23 23:47
2F：→ hatepig:移项一下 就知道罗 10%/80%.... 03/23 23:48
3F：→ scont:谢谢你~ 03/23 23:50
4F：推 hatepig:我10分钟前刚好做到这题耶 真巧 呵呵~~~ 03/23 23:52