A Custodian plans to repaint some classroom bookcase. She has 5 1/4 gallons of paint. All the bookcases are the same size and each requires 3/4 gallons of paint. How many bookcases will the custodian be able to repaint with the amount of paint.

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