In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 75 questions and secures 125 marks, the number of questions he attempts correctly, is : Choose the correct choice from the following answers:
A) 38
B) 40
C) 26
D) 25
E) 11
Explanation:   Let the number of correct answers be x.   Then numbers of incorrect answers will be 75 – x   We get 4x – (75 – x)×1= 125   On solving the equation we get x= 40   Answer: 40
<result>B</result>
In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 75 questions and secures 125 marks, the number of questions he attempts correctly, is :