Problema Solution
Ms. Rockwell surveyed the 34 students in her class about their families. 24 students have a brother or a sister, 11 students have a sister, and 9 students have both a brother and a sister. How many students have only a brother?
Answer provided by our tutors
24 students have a brother or a sister
11 have a sister and 9 have both brother and sister
hence
there a 13 students who only have a brother as 11 are having sister and in those 11,9 of them are haing brothers also.