You are going to read some articles about schools in Britain. For questions 1-9 choose from the schools (A-D). The schools may be chosen more than once. Which school:

1  is a comprehensive school? ___D______
2  is a boarding school for boys? ___B______
3  is a school where boys and girls study together? -------C-------
4  is a college of further education? _____A____
5  offers free education? ____A_____
6  prepares special food for pupils? ___B______
7  is for those who are good at sport? _____C____
8  concentrates on studying Maths and Information Technology? _____D____
9  was repaired and decorated not long ago? --------C------

Меди 20%цинка 80%20кг - 80%20%=80%/420кг/4=5кг5кг=20% -> масса меди = 5кг