https://www.gregmat.com/problems/quant?problem=section-1-and-2-have-30-questions
assuming 12 points deducted leaving score at exactly 90%, secion one gives a clue that 4 questions are wrong, but section 2 has 1 points deducted if wrong, which means that there is a possibility that more than 4 questions are wrong… can someone validate this?
4 wrong = 4* (-3) = -12
26 correct = 26*1 = 26
Assuming full scores for sections 2 and 3, ie 90 points.
(90 + 26 - 12) = 104 not 108
Case 1
This is where Ahmed can lose the least points, aka the worst case scenario.
3 wrongs = 3*(-1) = -3
27 correct = 27*2 = 54
Total = 54 - 3 = 51
Assuming full marks for Section 1 and 3,
30 + 51 + 30 = 111
Case 2
4 wrongs = - 4
26 correct = 26*2 = 52
Total = 52 - 4 = 48
Assuming full section 1 and 3 marks,
30 + 48 + 30 = 108
In this scenario, Ahmed gets exactly 90%.
When Ahmed got 4 wrongs on Section 2 (where he can lose the least points), he got exactly 90%.
Since question said he scored higher than 90%, he must gotten less than 4 questions wrong.