Translation of suposición

The Institute is using the technology with great success, in the departments that I mentioned to you on the phone. Several universities in Europe are also testing it, but we cannot publish that.
The place I have been to is famous for its many language schools. People come from all over the world to learn Spanish and practise their language skills. I guess there are more than two hundred schools there.
We then went out to have a drink at a bar near the hotel. There were mostly foreigners at the bar. All in all, we had the impression that there were many Westerners living in the city which gave this mix.