Word problem

[soft edge]

How many 10mm pom poms can fit on a 20.75''x16.75'' (outer) 19.5''x15.5'' (inner) picture frame?

Ive been trying to solve this for 20min please help!!

[tough path]

10mm diameter?

[soft edge]

Yes. We can sub for squares!

I got aprox. 372 poms poms. My problem isnt looking for an exact anwser