How do I answer this question?

Question

1. Maria has 2 spools of ribbon. One spool holds 3 yards of ribbon, and the other spool holds 2 yards of ribbon. She uses all the ribbon to cut bookmarks that are each ¼ yard long. How many bookmarks does Maria make?

Answer 1

3+2 = 5 yards

5 divided by 1/4 = 5 x 4 = 20 bookmarks

division = multiplication if you flip the divisor upside down. division by 1/4 is the same as multiplication by 4