Suraj is one third as good as workman as Pankaj and together they finish a piece of work in 36 days. The number of days taken by Suraj alone to finish the work is

Ratio of efficiency of Pankaj & Suraj = 3:1 & they do a job in 36 days so let total work = (3+1)`xx` 36 = 144 units Hence Suraj alone will finish this job in = 144/1 = 144 days

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