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The ratio between the marks obtained in Unit test by P and Q is 3 : 4. But due to wrong question each student get 5 marks as a bonus, then the ratio of marks obtained in Unit test by P and Q is 7 : 9. Find the difference between the original marks obtained by Q and P in Unit test.1. 102. 253. 304. 155. 21 |
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Answer» Correct Answer - Option 1 : 10 Given: Let marks obtained by P and Q in unit test be 3a and 4a respectively. ⇒ (3a + 5) : (4a + 5) = 7 : 9 ⇒ 27a + 45 = 28a + 35 ⇒ a = 10 The original marks obtained by P = 3 × 10 = 30 The original marks obtained by Q = 4 × 10 = 40 ∴ Required difference = 40 - 30 = 10 |
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