1. You should wear a swimming cap in the swimming pool.

2. You should wear a swimming cap at the swimming pool.

(Which preposition should we use? Are both OK?)

3. What is your number?
- My number is 22.

4. May I have your number?
- My number is 22.

5. What number are you?
- I am 22.
(Are all the questions and answers correct in Sentence 3 to Sentence 5?)

1 answer

The better preposition is "in."

Everything else is correct.