In an examination, 35% of total students failed in Hindi, 45% failed in English and 20% in both. The percentage of these who passed in both the subjects is : Options
A) 23
B) 37
C) 28
D) 40
E) 81
Explanation:   Formula n(a∪b) = n(a) + n(b) − n(a∩b)   Fail in Hindi or English = 35 + 45 – 20 = 60   Therefore students who passed = 100 – 60 = 40.   Answer: 40
<result>D</result>
In an examination, 35% of total students failed in Hindi, 45% failed in English and 20% in both. The percentage of these who passed in both the subjects is :