the maximum point is 150 (6*25)
so he had somehow minus 94 points from the maximum.
Each wrong answer gives you minus 8 points from the maximum points.
(-6 for not getting it correct and the minus 2 for answering wrong).
So the question is now.
How many questions can go wrong and still get 56 points?
The answer is
so 12 questions can go wrong and u can still get 56 points.
That leaves you with 25-12 = 13