In an examination, 35% of total students failed in Bangla, 45% failed in English and 20% failed in both. Find the percentage of those students who passed in both the subjects?

Question: In an examination, 35% of total students failed in Bangla, 45% failed in English and 20% failed in both. Find the percentage of those students who passed in both the subjects?

Solution:
Failed students in Bangla = 35%
Failed students in English = 45%
Student failed in both subject Bangla and English = 20%

Student only fail in Bangla = (35 - 20)% = 15%
Student only fail in English = (45 - 20)% = 25%

Total fail students = (15 + 25 + 20)%
= 60%

Percentage of passed students in both subjects = (100 - 60)%
= 40%