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Question

In a class test, 3 marks are awarded for each correct answer and -1 marks are awarded for each incorrect answer. A student scored 25 marks and had answered 10 questions correctly. How many questions did he answer incorrectly?

A
2
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B
3
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C
5
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D
7
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Solution

The correct option is C 5
Marks awarded for each correct answer = 3
Marks awarded for each incorrect answer =(-1)
Marks obtained by the student = 25
Marks obtained by answering 10 questions correctly =10×3=30

So, total negative marks = 25 - 30 = -5

Therefore, total number of incorrect answers =51=5

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