DRDO Multi tasking staff Model paper 6

From given data
No of students failed in hindi n(H) = 30%
No of students failed in English n (E) = 25%
No of students failed in both n(H ∩ E) = 10%
⇒ Percentage of students who failed n(H U E) = n(H) + n(E) – n(H ∩ E)
⇒ n(H U E) = 30 + 25 - 10
⇒ n(H U E) = 45
Percentage of students who passed = 100 - (Percentage of students who failed) = 100 - 45 = 55%