5. In an examination 70% of the candidates passed in Physics, 80% passed in Chemistry and
5% failed in both. If 220 candidates passed in both, how many candidates appeared for the examination.
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Answer :
Ther are total 400 students
step by step explanation :
- 220 students passed in a both subjects
- x is the percentage of students passed in a both subjects
- total = 100 %
- passed students = ( 100 - 5 ( failed students) ) % = 95 %
- 95 % is the passed students
- So , passed students in a both subjects is x
- So , ( 70 + 80 - 95 ) = 55 %
- Now x = 55 %
- 55 % of total students = 220
- 55 / 100 × total students = 220
- total students = 220 × 100 / 55
- total students = 400
- there were total 400 students
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