Thanga and Thumdang together can do a work in 6 days, which Thumdang and Mono together can do in 7½ days, and Mong and Thanga together in 10 days.
In how many days can Thumdang alone do 2/3rd of the work?
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Thumdang alone can do 2/3rd of the work in 20/3 days.
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