So if every student buys five pieces of candy, he gets two. And if someone buys 35 pieces of candy, think like this:
How many times does 2 go into 35? It doesn't go into 35 evenly because 35 is an odd number. So, you will get a decimal as your answer. 35 ÷ 2 is 17.5, so you put it like this:
If George buys 35 pieces of candy, Biff will take 17 whole candy bars and half of one. (17 1/2). Hope this helps!