Question

There are 130 people in a sport centre.

73 people use the gym.
62 people use the swimming pool.
58 people use the track.
22 people use the gym and the pool.
29 people use the pool and the track.
25 people use the gym and the track.
11 people use all three facilities.
Given that a randomly selected person
uses the gym and the track, what is
the probability they do not use the
swimming pool?

Answer 1

substract every person using pool from gym and track

73-22=51
58-29=29
Now add them,
51+29=80
substract the people who uses everything which was
80-11=69

69 in the answer