Which figure of speech is used in this text?
We were expecting twenty guests, but only ten came. We had enough extra food to feed the entire town!

 - hyperbole
 - euphemism
The text uses hyperbole, an obvious exaggeration that is not meant to be taken literally.
Feed the entire town is an exaggeration, since it's unlikely that there would be enough food to feed the number of people who live in a town.