IBM Company Numerical Ability Permutation and Combination

In a school 10 can play cricket but only 5 can play both cricket and foot ball 8 can play only football .
what is the number of students.

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IBM Other Question

In a college students can play cricket or basketball. 500 play cricket. 220 played both and 600 played basketball. What is the total strength of college? On a particular day, students who visited a canteen ordered either a burger, a pastry or a sandwich. 19 students had a burger, 25 had a pastry, and 27 had a sandwich. 7 students had a burger and a pastry but not a sandwich, 9 had a pastry and sandwich but not a burger, 5 had a burger and sandwich but not a pastry. 3 students had a burger, a pastry and a sandwich.
How many students had only a burger?
How many students had only a pastry?
How many students had only a sandwich?