Well, to factor out we have to find the gratest common factor of 54 and 24 which is 6. then divide both numbers by that number
54/6=9 24/6=4
6(9a+4b) is your final answer
Let x= width
Length= 5x-4
2(x)+2(5x-4)=160
2x+10x-8=160
12x-8=160
+8. +8
12x=168
x=14
width=14
length= 5(14)-4=66
I only did the first part but maybe later I will solve the rest too. If there are any errors but tell me so I can update the pic.