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2014-07-27T19:50:40+05:30

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Let the total no of students be x,
65%  students passed,
Therefore, no of students passed =   \frac{65}{100}  × x =  \frac{13x}{20}

No. of students failed = 420
The equation we can form,
x -  \frac{13x}{20} = 420

 \frac{20x - 13x}{20} = 420

7x = 420 × 20

x =  \frac{420*20}{7}

x = 1200

The total no of students who appeared the exam is 1200.
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2014-07-29T16:20:41+05:30
let the total no:of students be "X" 
no: of students passed = 65/100 * x = 13x/20
failed = 420
 X - 13x/20 = 420 
20x - 13x
---------------       = 420

7x = 420 * 20
x=420 * 20
_____________ _    =1200
       7
answer = 1200

 

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