45 of the magnets in George's collection are flags. 12 of those flags are U. S. flags. What fraction of George's magnets are U. S. flags?

For this case, what you must do is perform the following division:

N = (U. S. flags.) / (Total flags)

We have then:

N = 12/45

Simplifying:

N = 4/15

Answer:

The fraction of George's magnets are U. S. flags is:

N = 4/15