Question:In an examination, `35%` of total students failed in hindi, `45%` failed in English and `20%` in both. The percentage of those who passed in both the subjects is : 

A `10` 
B `20` 
C `30` 
D `40` 

+ Answer
D 

+ Explanation
`n (A) = 35,`

`n (B) = 45,`

`n (AnnB) = 20.`

`n(AuuB) = n(A) + n(B) - n (AnnB)`

`= (35 + 45 - 20)`

`= 60.`

:. Number failed in one or the other or both

`= 60.`

:. Number passed 

`= 40%.`

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