Question

A chef makes 4 different quiches as the special of the day. At the end of the day, each dish had 3/8 of the quiche left. How much quiche was bought in all?
Could someone please explain how to solve this problem?
Ms. Sue
(5/8) * 4 = 20/8 = 2 1/2

Marsha
2 1/2 is what I got but that is not an answer choice we were given to choose from in the book, so now I don't know.