Question

if an examination 60% of candidate passed in English and 75% of the candidate passed in mathematics but 20% failed in both of the subject if 2500 candidate passed in both the subjects the number of candidates who appeared at the examination was

Answer 1

solution:
let total no of students appeared = x
60% passed in English = 0.6x
75% passed in Maths = 0.75x
20% failed in both = 0.2x
passed in both = 2500

so, total =
0.6x + 0.75x + 0.2x - 2500 = x
1.55x - x = 2500
0.55x = 2500
x = 4545.4545
so approximately 4545 students appeared for exam
hope that helps!!!

Answer 2

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