In an exam of 80 questions, a correct answer is given + 1 mark, a wrong answer is given -1 mark, and if a question is not attempted there are zero marks. If a student attempted only 80% of the questions and got 32 marks, then how many questions did he answer correctly?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 48.
| Understanding |
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Total number of questions = 80 No of attempted questions = 80% of 80 = 64 No of questions answered correctly = x Then the number of questions answered wrong = 64 - x According to the question; x × 1 + (64 - x) × (-1) = 32 x - 64 + x = 32 x = 48 Hence, option 2 is the correct answer. |