If Stu has 9 books and Albert has 4 times as many books as Stu, how many books do Stu and Albert have in total?
Albert has 4 * 9 books belonging to Stu = <T>multiply(4, 9)=36 books.
So the pair have a combined total of 36 books belonging to Albert + 9 books belonging to Stu = <T>add(36, 9)=45 books.
