At a private resort,35 people swim, 24 play tennis, and 27 jog. Of these people, 12 swim and play tennis, 19 play tennis and jog, and 13 jog and swim. Nine people do all three activities. How many members are these all together?
Answer provided by our tutors
We can solve using Venn's diagram (see bellow).
There are: 19 + 2 + 4 + 3 + 4 + 10 + 9 = 51 members.