in a test (+4) marks are given for every correct answer and (-2) marks dor every wrong answer. Rohit answered all the questions and scored 68 marks 25 of Rohit answer were correct.
How many of the questions he attempted were incorrect?
please help
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Step-by-step explanation:
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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