In 2 years, Maxwell will be twice his sister's age. If his sister is now 2, how old is Maxwell now?
In two years, Maxwell's sister will be 2 years + 2 years = <T>add(2, 2)=4 years old.
Therefore, Maxwell will be 4 years x 2 = <T>multiply(4, 2)=8 years old in two years.
Maxwell is now 8 years - 2 years = <T>subtract(8, 2)=6 years old.
