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In an examination, 120 questions were asked. As there was negative marking, Reena decided not to attempt 15 questions. Each question carries 2 marks. 80% of her answers were correct. For a wrong answer 1 mark is deducted. How many marks were obtianed by Reena in the examination?
  • a)
    140
  • b)
    147
  • c)
    152
  • d)
    168
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In an examination, 120 questions were asked. As there was negative mar...
Understanding the Problem
To calculate Reena's total marks, we need to analyze the given data regarding the examination.
Details of the Examination
- Total questions: 120
- Questions not attempted: 15
- Questions answered: 120 - 15 = 105
- Marks per question: 2
- Percentage of correct answers: 80%
Calculating Correct and Wrong Answers
- Correct answers:
- 80% of 105 = 0.8 * 105 = 84
- Wrong answers:
- Total answered - Correct answers = 105 - 84 = 21
Calculating Total Marks
- Marks from correct answers:
- 84 correct answers * 2 marks each = 168 marks
- Marks deducted for wrong answers:
- 21 wrong answers * 1 mark deducted each = 21 marks deducted
Final Marks Calculation
- Total marks obtained by Reena:
- Marks from correct answers - Marks deducted for wrong answers = 168 - 21 = 147
Conclusion
Reena obtained a total of 147 marks in the examination. Therefore, the correct answer is option 'B'.
Free Test
Community Answer
In an examination, 120 questions were asked. As there was negative mar...
Calculation:
In the exam total questions = 120
Now, she didn't attempt 15 question, so her total attempts = (120 - 15) = 105
Here, 80% of her attempted questions were correct, so total correct questions = (105 × 80/100) = 84, incorrect attempt = 21
So, total marks obtained by Reena = (84 × 2) - 21 = 147
∴ The correct answer is 147
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