In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 80 questions and secures 130 marks, the no of questions he attempts correctly is :
Choices.
A) 35 B) 38 C) 90 D) 88 E) 42

Rationale: "let the number of correct answers be x . number of incorrect answers = ( 60 – x ) . 4 x – ( 80 – x ) = 130 = > 5 x = 210 = > x = 42 answer : e"
Answer: E