Answer :
she can hang 27 pieces of artwork
Explanation
Step 1
find the total string,
to do that , we need to use an addition
so
total string= yellow screen + green string
replacing we have
[tex]\begin{gathered} total\text{ =5 yd+ 4 ydd} \\ total\text{ =}9\text{ yds} \end{gathered}[/tex]Step 2
now, she cuts the total in 1/3 yd, so
we need to make a divison
[tex]\begin{gathered} \text{ Number of pieces= }\frac{total\text{ length}}{\text{size per piece}} \\ \text{replacing} \\ \text{ Number of pieces= }\frac{9\text{ yd}}{\frac{1}{3}\frac{yd}{\text{ Piece}}}=\frac{\frac{9\text{ yd}}{1}}{\frac{1}{3}yd}=\frac{9\text{ yd}\cdot3\text{ pi}ece}{1\text{ yd}}=27\text{ pieces} \end{gathered}[/tex]therefore, she can hang 27 pieces of artwork
I hope this helps you