Joe bought two cups of coffee and five donut for a total of 60 the next day he bought six cups of coffee and seven donuts for a total of 44 how much does a cup of coffee cost and how much is a donut

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