John climbs up 9 flights of stairs.  Each flight is 10 feet.  If each step is 18 inches, how many steps does he climb up?
He has to climb 9*10=<T>multiply(9, 10)=90 feet
That means he needs to climb 90*12=<T>multiply(90, 12)=1080 inches
That means he needs to climb 1080/18=<T>divide(1080, 18)=60.0 stairs
