Question 1204707
<font color=black size=3>
Hints:
<font color=red>w</font> = <font color=red>width</font>
<font color=blue>3w+20</font> = <font color=blue>length</font>
2*(<font color=blue>length</font>+<font color=red>width</font>) = perimeter
2*(<font color=blue>3w+20</font>+<font color=red>w</font>) = 256


I'll let the student solve for variable w. 
Once you determine w, use it to compute 3w+20.
</font>