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Question Number 122426 by Lordose last updated on 16/Nov/20

  In an exam 36% of people failed in   physics and 49% failed in maths and 15%  failed in both subject. If the total   number of student that passed physics  only is 680 find the total number of  students that appeared in the exam .

$$ \\ $$$$\mathrm{In}\:\mathrm{an}\:\mathrm{exam}\:\mathrm{36\%}\:\mathrm{of}\:\mathrm{people}\:\mathrm{failed}\:\mathrm{in}\: \\ $$$$\mathrm{physics}\:\mathrm{and}\:\mathrm{49\%}\:\mathrm{failed}\:\mathrm{in}\:\mathrm{maths}\:\mathrm{and}\:\mathrm{15\%} \\ $$$$\mathrm{failed}\:\mathrm{in}\:\mathrm{both}\:\mathrm{subject}.\:\mathrm{If}\:\mathrm{the}\:\mathrm{total}\: \\ $$$$\mathrm{number}\:\mathrm{of}\:\mathrm{student}\:\mathrm{that}\:\mathrm{passed}\:\mathrm{physics} \\ $$$$\mathrm{only}\:\mathrm{is}\:\mathrm{680}\:\mathrm{find}\:\mathrm{the}\:\mathrm{total}\:\mathrm{number}\:\mathrm{of} \\ $$$$\mathrm{students}\:\mathrm{that}\:\mathrm{appeared}\:\mathrm{in}\:\mathrm{the}\:\mathrm{exam}\:. \\ $$

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