The Lawn Order lawnmower factory can produce 12 lawnmowers in 4 hours. How many hours will it take the factory to produce 63 lawnmowers?
A] 9 hours
B] 7 hours
C] 12 hours
D] 21 hours
8 / 12 = 4 * 2 / (4 * 3 ) = 2 / 3 hours / lawnmower
30 * 2 / 3 = 60 / 3 = 20 hours