In five years Sam will be 3 times as old as Drew. If Drew is currently 12 years old, how old is Sam?
In five years Drew will be 12+5=<T>add(12, 5)=17 years old.
In five years Sam will be 3(17)=51 years old.
Sam is currently 51-5=<T>subtract(51, 5)=46 years old.
