James makes potatoes for a group.  Each person eats 1.5 pounds of potatoes.  He makes potatoes for 40 people.  A 20-pound bag of potatoes costs $5.  How much does it cost?
He needs 1.5*40=<T>multiply(1.5, 40)=60.0 pounds of potatoes
So he needs to buy 60/20=<T>divide(60, 20)=3.0 bags of potatoes
So it cost 3*5=$<T>multiply(3, 5)=15
