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In an Examination the Ratio of the Number of Suo:Essful Candidates to Unsuccessful Candidates is 7:5. - ICSE Class 10 - Mathematics

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Question

In an examination the ratio of the number of suo:essful candidates to unsuccessful candidates is 7:5. Had 30 more appeared and 10 more passed, the ratio of successful candidates to unsuccessful candidates would have been 4:3. Find the number of candidates who appeared in the examination originally.

Solution

Let successful candidates be 7x and unsuccessful candidates be 5x.

Now , (7"x" + 10)/(5"x" + 20) = 4/3

⇒  21x + 30 = 20x + 80

⇒ x = 50

7x = 7 x 50 = 350

5x = 5x50 = 250

.·. 7x + 5x = 350 + 250 = 600

Therefore, there were 600 candidates originally.

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APPEARS IN

Frank Solution for Frank Class 10 Mathematics Part 2 (2016 to Current)
Chapter 9: Ratio and Proportion
Exercise 9.1 | Q: 30

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Solution In an Examination the Ratio of the Number of Suo:Essful Candidates to Unsuccessful Candidates is 7:5. Concept: Ratio and Proportion Example.
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