Machine P and Machine Q are each used to manufacture 990 sprockets. It takes Machine P 10 hours longer to produce 990 sprockets than Machine Q. Machine Q produces 10% more sprockets per hour than Machine A. How many sprockets per hour does Machine A produce?	Choose the correct choice from the following:  A) 5  B) 6  C) 7  D) 8  E) 9
P makes x sprockets per hour.   Then Q makes 1.1x sprockets per hour.   990/x = 990/1.1x + 10   1.1(990) = 990 + 11x   11x = 99   x = 9   The answer is 9.
<result>E</result>
Machine P and Machine Q are each used to manufacture 990 sprockets. It takes Machine P 10 hours longer to produce 990 sprockets than Machine Q. Machine Q produces 10% more sprockets per hour than Machine A. How many sprockets per hour does Machine A produce?