We have:
x= the amount of rope.
x(boxes)= the amount of rope used to tie the boxes together.
Then, we have the following equation:
x-(1/4)x-5/9(x-(1/4)x)=120
(x-4/x)-(5x/9)+(5x/36)=120
(1/3)x=120
x=120x3
x=360 cm
x(boxes)=(1/4)360
x(boxes)=360/4
x(boxes)=90 cm
What is the length of rope Mr. Young used to tie the boxes together?
The lenght of rope Mr. Young used to tie the boxes together is: 90 cm.