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In a exam for 3 marks correct answer. Ans 1 mark for incorrect answers.
There are 50 questions in a question paper. If sagar got 78 marks. Then find out no. Of correct answered questions by sagar.
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No of questions Sagar answered correct = x
No of questions Sagar answered wrong = y
x + y = 50
3x - y = 78
Add both,
4x = 128
x = 32
y = 50 - 32
y = 18
No of correct answer = 32
No of wrong answer = 18
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