In an examination which had 200 questions, students score 4 marks for every correct answer and lose 1 mark for every wrong answer.
A student attempted all the 200 questions and scored 200 marks. The n

Question

In an examination which had 200 questions, students score 4 marks for every correct answer and lose 1 mark for every wrong answer.
A student attempted all the 200 questions and scored 200 marks. The number of questions, student answered correctly in the examination, is:

FirstInTest · Accepted Answer

Correct answer: C. Let x be the number of correct answers.
Then, the number of wrong answers is $200 - x$.
Total score = (marks for correct answers) - (marks for wrong answers)
$200 = 4x - 1(200 - x)$
$200 = 4x - 200 + x$
$200 = 5x - 200$
$400 = 5x$
$x = 80$.
So, the number of questions answered correctly is 80.

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