In an examination, a student scores 6 marks for every correct answer and loses 4 marks for every wrong answer. If he attempted 80 questions and obtained 310 marks, how many questions did he attempt correctly?
Answer & explanation
Correct answer: option 3
If all questions are correct, then max marks =80 × 6 = 480
If all questions are wrong, then max marks = 80 × 4 = - 320
Now, lets Use allegation method:
