If you are currently at the place in question, then you wouldn't use "could".
Originally Posted by CoolSir
- How many people are there?
- I can see about a hundred people.
Unless you actually count exactly one hundred people, it's better to use an approximation like "about a hundred".
If you were asked how many people had been there after you left the location:
- How many people were there?
- I could see about a hundred people.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.