Question

Andy and Robert are walking to school with a total of 12 books. If Andy has one-third as many as Robert, how many does Andy have?

Answer 1

Answer:

3

Step-by-step explanation:

Let A be the number of books that Andy has.

Andy has one-third as many books as Robert  =>  Robert has three times as many as Andy  =>  Robert has 3A books.

In total they have 12 books  =>  A + 3A = 12  =>  4A = 12  =>  A = 3

So Andy has 3 books.