Education and Career Forum

There are total 15 people. 7 speaks French and 8 speaks Spanish 3 do not speak any language.
Which part of total people speaks both languages

TOTAL NO. OF PEOPLE ARE 15
from these 15 people 3 donot speak any languange
so,
people who will speak at least one languange is 15-3=12
no. ofpeople who will speak at least one languange = (no. of people who speaks french) + (no. of people who speak spanish) -( no. of people who speak both languages)
12=7+8- (no. of people who speak both languages)
no. of people who speak both languages = 3
answer is 3