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A and B together can complete atask in 15 days. B and C together can complete the same task in 20 days. A and C together can complete the same task in 30 days'. What is the respective ratio of the number of days taken by A while completing the same task alone to the number of days taken by C while completing the same task alone?

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A and B together can complete atask in 15 days. B and C together can complete the same task in 20 days. A and C together can complete the same task in 30 days'. What is the respective ratio of the number of days taken by A while completing the same task alone to the number of days taken by C while completing the same task alone?






 
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