Travis is preparing cookies and brownies for a reception at the children's hospital. when
checking the ingredients that he has on hand, he discovers that he has plenty of everything except
sugar. he has only 18 cups of sugar and does not want to go the store to buy more. each batch
of cookies requires 1.5 cups of sugar, and each batch of brownies requires 3 cups of sugar. he
needs to serve 480 people with either a cookie or a brownie. each batch of cookies makes 60
cookies, and each batch of brownies makes 40 brownies. each batch of cookies costs $8 to
make, and each batch of brownies costs $5 to make. how many batches of cookies and how
many batches of brownies should he make if he wants to minimize his costs?