May you pls help me you're suppose to rotate it 180 degrees (see picture)

How do you solve a question like this?

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field