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=10 pounds of pork
So he has 20+10=30 pounds of meat
That means he can make 30/1.5=20 meals
So he makes 20*20=$400