There are 12 boxes of books to put on shelves can you spell it has 31 bucks each shelf holds 18 books Kevin estimates he will need 20 shells for all the books
Well if you do 31 books each box times 12 boxes you get 372 books and each shelf holds 18 books so if you do 372 divided into 18 books each shelf you would get 20 shelves Hoped this helped
