In an examination, 34% of the students failed in Mathematics and 42% failed in English. If 20% of the students failed in both the subjects, then the percentage of students who passed in both the subjects was :
A. 44%
B. 50%
C. 54%
D. 56%
Answer: Option D
Solution(By Examveda Team)
$$\eqalign{ & n\left( A \right) = 34 \cr & n\left( B \right) = 42 \cr & n\left( {A \cap B} \right) = 20 \cr & {\text{So, }} \cr & {\text{n}}\left( {A \cup B} \right) \cr & = n\left( A \right) + n\left( B \right) - n\left( {A \cap B} \right) \cr & = 34 + 42 - 20 \cr & = 56 \cr} $$∴ Percentage failed in either or both the subjects = 56%
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Comments ( 1 )
Related Questions on Percentage
A. $$\frac{1}{4}$$
B. $$\frac{1}{3}$$
C. $$\frac{1}{2}$$
D. $$\frac{2}{3}$$
they have asked who have passed in both the subjects! not who failed in both or either subject!
change your answer! it is 44% option (A)