31. Write numerals in numbers.

1. Students spend from 15 to 20 hours per week attending lectures.
2. The average academic performance at our faculty is 7.2.
3. The lecture hall can seat 256 students.
4. She scored 87 points on the exam.
5. Only 215 students passed the test.
6. The conference had 250,000 on-line participants.
7. The tuition fee is 2,527 rubles per semester.
8. The dormitory has 13 floors.
9. The exam lasts 90 minutes.
10. The scholarship covers 50% of costs.