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On a certain road, 10% of the motorists exceed the posted

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Joined: 20 Oct 2005
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On a certain road, 10% of the motorists exceed the posted [#permalink] New post 20 Nov 2005, 07:36
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On a certain road, 10% of the motorists exceed the posted speed limit and receive speeding tickets, but 20% of the motorists who exceed the posted speed limit do not receive speeding tickets. What percent of the motorists on that road exceed the posted speed limit?

a) 10.5%
b) 12.5%
c) 15%
d) 22%
e) 30%
GMAT Club Legend
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Joined: 07 Jul 2004
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 [#permalink] New post 20 Nov 2005, 09:39
Using total number of motorists as 100

10% exceed posted speed limit and receive speeding tic = 10

20% exceed posted speed limit and do not receive speeding tic = 20

So in all 30 people exceed speed limit = 30%
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 [#permalink] New post 20 Nov 2005, 12:31
B. 12.5

20% of the motorists who exceed the posted speed limit do not receive speeding tickets.
means:
80% of those who exceed the posted speed limit GETS the ticket. this is given as 10% of all who exceeds so

0.1 * all = 0.8 * who exceed or
people who exceed/ all = 1/8 or 12.5%
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  [#permalink] 20 Nov 2005, 12:31
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On a certain road, 10% of the motorists exceed the posted

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