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On a certain road, 10 percent of the motorists exceed the

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SVP
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Joined: 30 Mar 2006
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Kudos [?]: 28 [0], given: 0

On a certain road, 10 percent of the motorists exceed the [#permalink] New post 24 Jun 2006, 09:28
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A
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C
D
E

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19. 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 exceed the posted speed limit ?
(A) (B)
(C) 15% (D) 22%
(E) 30%
Senior Manager
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Joined: 07 Apr 2006
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 [#permalink] New post 24 Jun 2006, 09:34
incomplete? this question is familiar but it sems like u are missing some info - where is choice a and b?

the question is only telling you that 10% of speeders get tix and 20% of speeders dont, but it gives you no clue to the total # of drivers. Did you copy the question correctly?
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 [#permalink] New post 24 Jun 2006, 10:53
12.5%

Lets say x=total motorists, and x = 160

0.10(160)= 16 (motorists that exceed the posted speed limit and receive speeding tickets)

Let say y are the ones who exceed speed limit but didtn get a ticket.

(16+y)0.2=y
y=4

Total of motorists who exceed the Speed L. => 16+4=20

20/160=1/8=12.5%
_________________

Who is John Galt?

  [#permalink] 24 Jun 2006, 10:53
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