In a class 60% of the student pass in odia and 70% pass in English .if 20%of them fail in both subject. Find the what percentage of the student pass in both the subject.
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Given 60% have passed in Odia, i.e., 40% have failed
70% have passed in Engish, ie., 30% has failed.
Now, also given 20% have failed in both, and we are required to find how many of them have passed both.
For this, out of 100 students ... you need to subtract number of people failed in both, number of people failed in only Odia and English. i.e.,
=100 - 20 - (40-20) - (30-20)
=100 - 20 - 20 - 10
=50
Thus, 50% have passed in both the exams.
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