There's a Modern Languages reading exam where 200 students are being evaluated. The exam content is in French, Spanish and English and the results were as follows: 80 students are able to read English, 100 read French, 80 read Spanish. 55 students are able to read Spanish and French, 55 read English and can't read French. 60 read English and can't read Spanish, 15 read English and Spanish but can't read French. determine;
i. How many students are able to read the three languages?
ii. How many can read just French?
iii. How many can't read none of the three languages?
iv. How Many students can read Spanish but can't read French nor English?