A cup of dog food weighs 1/4 of a pound.  If Mike has 2 dogs that each eat 6 cups of dog food twice a day how many 20 pound bags of dog food does he need to buy a month?
Each dog eats 6*2=<T>multiply(6, 2)=12 cups of food a day
His two dogs eat 12*2=<T>multiply(12, 2)=24 cups a day
Thus they eat 24/4=<T>divide(24, 4)=6.0 pounds a day
So they eat 6*30=<T>multiply(6, 30)=180 pounds a month
So he needs to buy 180/20=<T>divide(180, 20)=9.0 bags of food
