Question 46

In an objective examination of 90 questions, 5 marks are allotted for every correct answer and 2 marks are deducted for every wrong answer. After attempting all the 90 questions a student got a total of 387 marks. Find the number of questions that he attempted wrong.

Solution

Let number of questions attempted wrong be $$x$$, and number of questions attempted correct be $$(90-x)$$

According to ques,

=> $$5(90-x)-2x=387$$

=> $$450-5x-2x=387$$

=> $$7x=63$$

=> $$x=\frac{63}{7}=9$$

=> Ans - (C)

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