Question

50. 80% of students of a class took Statistics and 45% took Mathematics. If each student took
Statistics or Mathematics and 40 took both, the total number of students in the class was:
(A) 160
(B) 180
(C) 200
(D) 225​

Answer 1

Answer:

Simple,

Simple,Use n(A U B) = n(A) + n(B) - n(A !''''! B)

Simple,Use n(A U B) = n(A) + n(B) - n(A !''''! B)so, 100% = 80% + 45% -40 = 125% -40

Simple,Use n(A U B) = n(A) + n(B) - n(A !''''! B)so, 100% = 80% + 45% -40 = 125% -4025% =40, 100% =160 Ans.