Answer :
(a) What is the ratio of new books to used books?
New books = 7
Used books = 12 - 7 = 5
Ratio = 7:5
(b) What is the ratio of all books to used books?
All books = 12
Used books = 5
Ratio = 12:5
New books = 7
Used books = 12 - 7 = 5
Ratio = 7:5
(b) What is the ratio of all books to used books?
All books = 12
Used books = 5
Ratio = 12:5