In an examination, a student scores 4 marks for every correct answer and losses 1 mark for every wrong answer. A student attempted all the 200 questions stud and scored 200 marks. Find the number of questions he answered correctly.

A) 82
B) 80

C) 68
D) 60

Correct answer:
B) 80

Description for Correct answer:
Let the number of correct answers be x

and number of wrong answers 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

Therefore, x = 80

Please provide the error details in above question

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