Question

There are 250 people at an international medical conference. 50 are africans, 80 are women and 180 are doctors. 20 of the women are Africans, 56 of the doctors are women and 35 of the Africans are doctors. If 10 of the African men are not doctors, how many of the African women are doctors?

Answer 1

35 African docs
50 Africans - 20 women Africans = 30 African men
30 African men - 10 not = 20 African men docs

35 African docs - 20 African men docs = 15 African women docs