Melanie made 72 peanut butter cookies and 60 oatmeal cookies. She wants to make identical groups of cookies for her friends. Each group will be as large as possible, and she will use all of the cookies. How many cookies will each friend receive? Complete the explanation to answer the question. The common factors of 72 and 60 in order are 1, 2, 3, 4, , and , which are the possible numbers of friends Melanie could have. So, each friend will receive either 11, , 33, , 66, or 132 cookies.