Brittany is older than Rebecca by 3 years, who is 25. Brittany goes on a 4-year vacation. How old is Brittany when she returns from her vacation?
Brittany is 25+3 = <T>add(25, 3)=28 years old.
Brittany is 28+4 = <T>add(28, 4)=32 years when she returns from her vacation.
