In 5 years, Heath will be 3 times as old as Jude.  If Heath is 16 years old today, how old is Jude today?
In 5 years, Heath will be 16 + 5 = <T>add(16, 5)=21 years old.
In 5 years, Jude will be 21 / 3 = <T>divide(21, 3)=7.0 years old.
The difference in their ages is 21 - 7 = <T>subtract(21, 7)=14 years.
Today, Jude will be 16 - 14 = <T>subtract(16, 14)=2 years old.
