Anil is twice as good a workman as Sunil and takes $3$ days less to do a piece of work than Sunil takes. Then Sunil can do that work in $x$-

Because Anil is twice as good a workman as Sunil, Anil takes half the time Sunil takes for the same work, so if Sunil takes x days, Anil takes x/2 days. The problem states Anil takes 3 days less than Sunil, which gives the equation x minus x/2 equals 3. Solving x/2 equals 3 yields x equals 6, so Sunil can do the work in 6 days.

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