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ATQ,
Let time taken by Ramesh to complete the work = t days
Sohan takes 2 × (3t/4) = 6t/4 = 3t/2 days.
Efficiency of Ramesh = 1/t,
Efficiency of Sohan = 2/3t.
Total efficiency = 1/t + 2/3t = 1/20 
Solving for t, we get t = 30 days.
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