in a test +4 marks are given for every correct answer and -2 marks for every incorrect answer.Rohit answered all the questions and scored 68 marks.25 of Rohit's answer were correct.How many of the questions he attempted were incorrect?
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Answered by
66
Given,+4 for correct answers and -2 for wrong answers.
Rohit scored 68 marks and 25questions of them were correct.
So, he got 4(25)=100 marks for right answers.
It is also given that Rohit attempted all the questions.
Total marks lost = 100-68=32.
Number of wrongly answered questions=32/2=16.
Therefore, 16 questions of the total questions attempted by him were incorrect.
Answered by
25
The answer is given below :
No. of correct answers = 25
So, marks secured = 25 × 4 = 100
Let, he did x no. of incorrect answers.
So, marks be cut = x × (-2) = -2x
Thus,
100 - 2x = 68
=> 2x = 100 - 68
=> 2x = 32
=> x = 16
So, Rohit did 16 incorrect answers and in total he attempted (25 + 16) = 41 questions
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