<p>Hey guys sorry but I have a quick maths problem that I didn't understand: </p>
<p>Q: If x and y are positive integers such that the greatest common factor of x^2y^2 and xy^3 is 45 then which of the following could y equal?</p>
<p>a. 45
b. 15
c. 9
d. 5
e. 3</p>
<p>Can someone also explain the concept to me. I don't understand that as well. </p>
<p>Thanks :)</p>