Venn diagram Problem

Question

There was an old woman who lived in a show. She had so many children, and they all liked to eat different foods for breakfast. Six children liked only toast. Four children liked both toast and cereal. If the old woman had twenty children, how many liked only cereal for breakfast?

Answer 1

6=only t, 4=t^c, 20= total who must have liked c, t or both

as they would go hungry if they didn't "like" at least one of them, like enough to eat one

6+4=10 = t or t^c, so 20-10 = c only = 10 who like only cereal