Question

help help pls pls pls​

Answer 1

Answer:

9

Step-by-step explanation:

The number of people who like one or the other (or both) is 36 - 3 = 33.

But it's also

(# who like tea) + (# who like coffee) - (# who like both)

where we subtract (# who like both) because otherwise we're counting those people twice, once in the "liking tea" group, and once in the "liking coffee" group.

Putting these together, we have

22 + 20 - (# who like both) = 33

which rearranged is

# who like both = 22 + 20 - 33 = 42 - 33 = 9.

Hope this helps.