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

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CEO
Joined: 15 Aug 2003
Posts: 3403
On a certain road, 10 percent of the motorists exceed the  [#permalink]

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13 Sep 2003, 06:50
1
00:00

Difficulty:

(N/A)

Question Stats:

50% (00:08) correct 50% (01:37) wrong based on 10 sessions

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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

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Intern
Joined: 03 May 2003
Posts: 28

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13 Sep 2003, 13:59
3
The wording sucks in this prob!!

t = total motorists
x = mortorists who exceed speed limit

.2x exceed limit and don't get tickets
so
.8x exceed limit and get tickets

.1t (10% of total exceed and get tickets) = .8x

.1t=.8x
x = .1t/.8

looking for x/t
(.1t/.8)/t = (.1t/.8)(1/t) = .1/.8 = 12.5%
Non-Human User
Joined: 09 Sep 2013
Posts: 8179
Re: On a certain road, 10 percent of the motorists exceed the  [#permalink]

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30 Aug 2018, 21:56
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Re: On a certain road, 10 percent of the motorists exceed the &nbs [#permalink] 30 Aug 2018, 21:56
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# On a certain road, 10 percent of the motorists exceed the

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