[問題] 一題數學
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)
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