On a certain road, 10% of the motorists exceed the posted speed limit and receive speeding tickets, but 60% 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?
Pick one
A) 10.5%  B) 12.5%  C) 15%  D) 25%  E) 30%
suppose there are X motorists.   10% of them exceeded the speed limit and received the ticket, i.e. X/10.   Again, suppose total no. of motorists who exceeded the speed limit are Y.   60% of Y exceeded the speed limit but didn't received the ticket, i.e. 3Y/5.   it means 2Y/5 received the ticket.   hence, 2Y/5 = X/10   or Y/X=1/4   or Y/X * 100= 1/4 * 100= 
<gadget id="calculator">1/4 * 100</gadget>
<output>25</output>
25%   25%
<result>D</result>
On a certain road, 10% of the motorists exceed the posted speed limit and receive speeding tickets, but 60% 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?