Question

Carol’s book shelf has 4 shelves with 6 books on each.Her Brother Robert has 3 shelves with 7 books on each.They want to combine their books.If they put 9 books on a shelf, how many shelves will they need?

Answer 1

they will need 5 shelves because 9x5=45.

6x4= 24

7x3=21

If you add 24 and 21 then you get 45.