Machine P and Machine Q are each used to manufacture 660 sprockets. It takes Machine P 10 hours longer to produce 660 sprockets than Machine Q. Machine Q produces 10% more sprockets per hour than Machine A. How many sprockets per hour does Machine A produce?	Pick one:  A) 5  B) 15  C) 55  D) 95  E) 6
P makes x sprockets per hour.   Then Q makes 1.1x sprockets per hour.   660/x = 660/1.1x + 10   1.1(660) = 660 + 11x   11x = 66   x = 6   The answer is 6.
<result>E</result>
Machine P and Machine Q are each used to manufacture 660 sprockets. It takes Machine P 10 hours longer to produce 660 sprockets than Machine Q. Machine Q produces 10% more sprockets per hour than Machine A. How many sprockets per hour does Machine A produce?