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On a certain road, 10 percent of the motorists exceed the [#permalink]
18 Feb 2004, 10:59
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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 ?
Let x be the % of drivers who exceed the speed limit.
# who exceed speed limit and receive ticket = 0.1
# who do not receive ticket but exceed speed limit = 0.2x
which means that 10% represents 80% of motorists who exceed the speed limit.