Answer :
Let the number of tie-dyed T-shirts = x
The man sold 4 times as many tie-dyed T-shirts as silk-screened shirts.
So, the number of silk-screened shirts = 4x
He sold 180 shirts altogether
So,
[tex]\begin{gathered} x+4x=180 \\ 5x=180 \\ \\ x=\frac{180}{5}=36 \end{gathered}[/tex]So, the number of tie-dyed shirts = 36