James buys 20 pounds of beef and half that much pork.  He uses 1.5 pounds of meat to make meals at his restaurant.  Each meal sells for $20.  How much money did he make?
He bought 20/2=<T>divide(20, 2)=10.0 pounds of pork
So he has 20+10=<T>add(20, 10)=30 pounds of meat
That means he can make 30/1.5=<T>divide(30, 1.5)=20.0 meals
So he makes 20*20=$<T>multiply(20, 20)=400
