Machine A and machine B are each used to manufacture 770 sprockets. It takes machine A 10 hours longer to produce 770 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine A. How many sprockets per hour does machine A produces? Options: A) 5 B) 7 C) 9 D) 10 E) 12
Machine 7: Takes x hours to produce 770 sprockets   Machine A: Takes (x+10) hours to produce 770 sprockets   Machine 7: In 1 hour, 7 makes 770/x sprockets   Machine A: In 1 hour, A makes 770/(x+10) sprockets   Equating:   1.1(770/(x+10)) = 770/x   847/(x+10) = 770/x   847x = 770x+7700   77x = 7700   x = 100   A makes   770/(110)= 
<gadget id="calculator">  770/(110)</gadget>
<output>7</output>
7 sprockets per hour   Answer : 7
<result>B</result>
Machine A and machine B are each used to manufacture 770 sprockets. It takes machine A 10 hours longer to produce 770 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine A. How many sprockets per hour does machine A produces?