Question

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?​

Answer 1

Answer:

Step-by-step explanation:Let the no. of correct answer be x and the no. of incorrect answer be y.

If there were 60 questions then

x+y = 60

As Yashwant had attempted all the questions and he got 90 marks and for correct answer he would get 2 marks and for incorrect answer he would lose 1 mark then

2x - y = 90

So

  x + y = 60                                                Adding both

+2x-y = 90                                                  the equations

 ________

2x + x + y - y = 150

3x = 150

x = 50

So y= 60 - 50 = 10

Therefore he got 10 questions wrong.