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Laxman and Rajkumar can do a work in 12 days. Rajkumar and Suman can do it in 15 days while Suman and Laxman can do it in 20 days. In how many days will they complete it together?

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Laxman and Rajkumar can do a work in 12 days. Rajkumar and Suman can do it in 15 days while Suman and Laxman can do it in 20 days. In how many days will they complete it together?






 
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