Given a statement, generate a question such that the answer is contained in that statement.

An electronic device is used for getting sums.
What is used to get sums?

fish secrete a mucous covering over their exterior to help protect from predators and parasites and reduce friction with the liquid substance they live in.
What do fish secrete over their exterior to help protect against predators and parasites?

working out requires a lot of fuel.

What does working out require?