In a group of students, 65 play foot ball, 45 play hockey, 42 play cricket, 20 play foot ball and hockey, 25 play foot ball and cricket, 15 play hockey and cricket and 8 play all the three games. find the total number of students in the group  (assume that each student in the group plays at least one game).

100 Students

Step-by-step explanation:

First write down all the data (this makes it easier )

Total number of students = ?

Students who play football = 65

Students who play hockey = 45

Students who play cricket = 42

Students who play football and hockey = 20

Students who play football and cricket = 25

Students who play hockey and cricket = 15

Students who play all three games = 8

Now let's start working

Students who play football and hockey = 20 - 8 = 12

Students who play football and cricket = 25 - 8 = 17

Students who play hockey and cricket = 15 - 8 = 7

Students who only play football = 65 - ( 17 + 8 + 12) = 28

Students who only play cricket = 42 - (17 + 7 + 8) = 10

Students who only play hockey = 45 - (12 + 8 + 7) = 18

Students who play all three games = 8

Now just add all these values up

TOTAL NUMBER OF STUDENTS = 12 + 17 + 7 + 28 + 10 + 18 + 8

= 100 students

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i