Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Fact: one day is equal to 24 hours
Saturday and Sunday together are?

Fact: a computer controls a robot
What is essential for a robot to possess to walk up a flight of stairs?

Fact: a producer produces its own food

Which is more accurate?