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Q.1. Raj, Ramesh and Arnav can do a piece of work in 5 days. If Raj alone can do a work in 10 days and Arnav alone can do it in 15 days, in how many days Ramesh can do the work alone?
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Please refer the following link for answer to similar query
https://www.meritnation.com/ask-answer/question/ram-shyam-and-mohan-can-build-house-in-8-days-ram-and-s/direct-and-inverse-proportions/12348187
Regards,