what expression is the simplified form of 20x^2y^5/4xy^3
20 x^2 y^5
--------------------- = 20/4 x^2/x y^5/y^3 = 5xy^2
4 x y^3
20x^2y^5/4xy^3
The way you typed it, it would be 5 x^3 y^8
If you meant: 20x^2y^5/(4xy^3) , which is more likely, then
= 5 x y^2