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OpenStudy (anonymous):
The ratio of pasing to failing students in a certain class is 5:2. Which of the following could be the total number of students in the class? 1. 12 2. 15 3. 21 4. 30 5. 34
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Parth (parthkohli):
Let's say that the number of students passed is 5x and failed is 2x. Then the sum would be 5x + 2x = 7x, which means that we'll have a multiple of 7. Search for a multiple of 7 in the options :)
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