In a survey of 85 amusement parks, it was found that

24 had a hotel on site

55 had water slides

38 had a wave pool

13 had a hotel on site and water slides

10 had a hotel on site and a wave pool

19 had water slides and a wave pool

7 had all three features

How many of the amusement parks surveyed had (a)at least one of these features ,(b) exactly two of these features,(c) none of these features