# In a competitive examination, there were 60 questions. The correct answer would carry 2 marks, and for incorrect answer 1 mark would be subtracted. Yashwant had attempted all the questions and he got total 90 marks. Then how many questions he got wrong?

Let the no of questions he got wrong be 'x'

And the no of questions he got right be 'y'

As, he attempted all the questions,

x + y = 60

y = 60 - x eq.

Also, he carries 2 for each corrects question and (-1) for each wrong question, also he got 90 marks

y(2) + x(-1) = 90

2y - x = 90

2(60 - x) - x = 90 eq.[Using 1]

120 - 2x - x = 90

-3x = -30

x = 10

he got 10 wrong questions.

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