Correct Answer: 80
Explanation:
Let the number of correct answer be x and number of wrong answer be y.
Then, 4x - y = 200 ..(i)
and x + y = 200 ..(ii)
On adding Eqs. (i) and (ii), we get
4x - y = 200
x + y = 200
----------------
5x = 400
∴ x = 80
Discussion & Comments