Eddy remembers that the number of a student who liked vanilla was 1/5 of the number who liked almond

I don't really understand this question. But I'll do my best to answer it.
So say that one student liked vanilla, and that student was 1/5 out of kids who liked almond. If that student was the only one out of five students that didn't like vanilla and liked almond, then four more students liked almond, and that one student was left out. So Eddy was right

Again, I don't understand what answer you want. Sorry. :/

Figure it out your self