people beliefs

2 people believed in all 3
if 4 people believed in ufos and bigfoot subtract the 2 from those who believed in all three so 2 goes in that spot
6 believe in ghost and bigfoot so subtract the 2 that believe in all three as well you get 4 people
to get bigfoot, ufos, and ghost you have to add up all combined in categories that are similar than subtact from the number written

29+2+13+4+30+9+2=89