Answer
$4x^4y^3$
Work Step by Step
The $GCF$ of $
16,8,
$ and $
20
$ is $
4
.$
The $GCF$ of $
x^5,x^6
$ and $
x^4
$ is $
x^4
.$
The $GCF$ of $
y^4,y^3
$ and $
y^5
$ is $
y^3
.$
Hence, the $GCF$ of the given expressions, $
16x^5y^4,8x^6y^3,
\text{ and } 20x^4y^5
,$ is
\begin{array}{l}\require{cancel}
4x^4y^3
.\end{array}