Let's do this problem step-by-step. There are 12 inches in a foot, right? So first, multiply 12 and 20, which is 240. So they have 240 inches of ribbon. Now they need to cut the pieces into two-inch pieces, so I would divide by 2 next. 240 divided by 2 is 120. Then, all you have to do is subtract 42 from 120, which is 78. There are 78 pieces left to cut. Hope this helps!
