3 years ago James turned 27.  In 5 years Matt will be twice James age.  How old is Matt now?
James is now 27+3=<T>add(27, 3)=30 years old
In 5 years James will be 30+5=<T>add(30, 5)=35 years old
So in 5 years Matt will be 35*2=<T>multiply(35, 2)=70 years old
That means Matt is now 70-5=<T>subtract(70, 5)=65 years old
