In a competitive examination, one mark is awarded for every correct answer while 1
4
mark is
deducted for every wrong answer. A student answered 100 questions and got 80 marks. How
many questions did he answer correctly ? (Use Cramer’s rule to solve the problem).
3
Answers
Answered by
1
your answer is 20 question
clockkeeper:
it's definately wrong
Answered by
1
Answer:
The number of correct answers student gave out of 100 questions were 98 questions.
Step-by-step explanation:
As according to the question each correct answer is awarded with 1 mark each and the student have to solve 100 questions.
Considering here, each question is for 1 mark each and every incorrect answer will deduct 14 marks each. The total marks scored by the student 80.
No. of questions answered: 100
1 wrong answer: 100-14 = 86
2 wrong answer: 100 – 28 = 72
Thus, 8 marks extra must be given as grace marks or handwriting grace. Thus, the student scores 72 + 8 = 80.
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