| In an examination, a student scores 4 marks for every correct answer and loss 1 mark for every wrong answer. If he attempts all 75 questions and secures 125 marks, then the number of questions he attempts correctly, is |
A) 35
B) 40
C) 42
D) 46
Correct Answer: B
Solution :
| Let the number of questions attempted. Correctly is x. |
| \[\therefore \] \[(x\times 4)-1\times (75-x)=125\] |
| \[\Rightarrow \] \[4x+x-75=125\] |
| \[\Rightarrow \] \[5x=200\]\[\Rightarrow \]\[x=40\] |
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