Question

in an exam 70% students passed in english,65%passed in maths and 27%failed in both the subjects and 248 passed in both .find the total number of students who appeared for the exam​

Answer 1

If there are 100 candidates, then

candidates failed in english =30

candidates failed in Maths = 35

candidates failed in both = 27

candidates failed in atleast one subject = 30+35-27 = 38

candidates passed in both subjects = 62

If 62 candidates passed in both subjects, then total candidates = 100

If 248 candidates passed in both subjects, then total candidates = 100*248/62=400

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Answer 2

Failures in English =>100-70=30

Failures in maths =>100-65=35

Failures in both subjects =>27

Failures in one or both subjects = 100-38=62%

let the total students be x,

(x X 62)100=248

=>x=(248X100)/62=400