Question

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.​

Answer 1

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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