Question

In an examination if a student looses mark for the wrong answer and gets 1 mark for the
correct answer. If he got 30 marks for solving 54 questions, then how many questions were
correct?

Answer 1

So, how about this:

The difference in points between 54 and 30 is 24.

So 54-30=24.

This is how many points he was off by, this means that this is the amount of points that were canceled.

So 24/2 = 12.

He got 12 of those remaining 24 right, and 12 wrong.

So He got 30+12 right = 42 Questions right. and 12 wrong.

Answer 2

but the correct answer is 36.....

Answer 3

let r be right answers and w be wrong answers

r+w = 54
r-w = 30

adding equations:
2r = 84
r = 42

42 right , 12 wrong

Answer 4

is the question posted correctly?
loses 1 mark for wrong answer and gains 1 mark for right answer ?

Answer 5

the only way you end up with 30 marks with 36 right answers means he loses (1/3) mark for each wrong answer