MATH PUZZLE #12 SECOND LEG

(From 24th to the 30th January 2011)


BEING SPORTY 

In a particular school class all the students play some kind of sport: 12 of them play football, 13 play basketball and other 13 play tennis.

There are 3 people who play the three sports, 8 who play football and basketball, 4 who play basketball and tennis and finally 2 who only play football.

a) How many students are there in the class?

b)What is the ratio of students  who ONLY play basketball?  
You can send your answers to matecampanar@gmail.com

SOLUTION
Download Vass Réka's solution from Hungary