S,t,u do work in 30 days. their work efficiency was 20:15:12 then in how many days u alone can complete the work
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total work=30×(20+15+12)=30×47
work done bh u=30/12×47=705/6=117 1/2 days
work done bh u=30/12×47=705/6=117 1/2 days
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