Question

The maximum possible score in an exam was 80 and all questions carried equal weightage. For each correct answer 4 marks were awarded whereas for each wrong answer 1 mark was deducted. For no answer, the marks remained unchanged. A student got 57 marks in which he failed to attempt only 3 questions. Answer the number of questions he got correct as a percentage of total number of questions.

Answer 1

If each correct answer was worth 4 points, and the maximum score was 80, then there must have been 20 questions.

if he got x right and y wrong, we have, and only attempted 17 of the 20 questions, then

x+y = 17
4x-y = 57

5x = 74
Huh? x must be an integer. So Look for a typo.

In any case, if x turned out to be 15, then he got 15/20 = 75% correct

Answer 2

Yes it was typo.instead of 3 unanswered it was 2

Answer 3

Yes he failed to attempt 2 questions.thanks