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Find the number of students who took an exam if the ratio of those who passed to those who failed in the exam was 10 : 3. If 40 more students had taken the exam and 10 less had failed, then the ratio of those who passed to those who failed in the exam would have been 5 :1.

[SSC CGL Tier-2 9-March-2018 Maths Shift-2]
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