Question

This is really difficult, my answers were wrong plz help

Answer 1

for 11 I got 10 and for 12 got 17 but those were wrong

Answer 2

very close

Answer 3

50 people were surveyed.
10 own neither, so 40 people own either a dog or a cat or both.

Answer 4

so the answer for 11 is 40??

Answer 5

40 - 27 = 13
40 - 22 = 18

Answer 6

for #11 its 13 and for #12 its 18

Answer 7

We already know that 40 people own a dog or a cat or both.
If 27 own cats, then 40 - 27 = 13 own dogs.
If 22 own dogs, then 40 - 22 own cats.
We have this so far.