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Question

Answer

10 x 3 = 30 (assuming if she answered all 10 questions correctly)

30 – 15 = 15 (difference)

3 + 2 = 5 (points that she would have lesser for each question she answered incorrectly)

15/5 = 3

Ans : 3 questions.

To check :

7 (correct) x 3 = 21

3 (incorrect) x 2 = – 6

21 – 6 = 15 marks earned.

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This is a Quantity Each Product question. 

   Quantity    Each   Product       
Correct  10 – 1u 3 30 – 3u    
Wrong 1u – 2 – 2u    
Total 10   30 – 5u    

30 – 5u = 15

30 – 15 = 5u

5u = 15

1u = 15 ÷ 5 = 3 wrong questions

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