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Question

Answer

Marks gained for correct answer = 3

Marks lost for incorrect answer = 5

Marks lost for blanks = 4

Solve by assumption method

Let us assume that all responses are correct.

In that case, Total marks would be = 100 x 3 = 300. 

Marks lost due to blanks = 5 x 4  = 20

Marks after deducting for blanks = 300 – 20  = 280. 

She scored only 230. So marks she lost = 280 – 230 = 50. 

50 marks were lost due to incorrect answers. 

So, number of incorrect answers = 50 /5 = 10. 

Number of correct answers = 100 – 10 – 5 = 85

Verify

5 Blank answer = -5

10 wrong answer = -20

85 correct answer = 255

255 -5 -20= 230

 

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