Question

In a survey conducted among some people of a group, it was found that 50% of them liked coffee,
75% of them liked milk and 10% of them liked none; then:
a. Represent the above information in a Venn-diagram.
b. If there are 105 people who like both of them, find the number of people participated in the
survey.​

Answer 1

6is the answer why because I don't know