$A$ can do $\displaystyle \frac{1}{5}$th part of the work in $12$ days, $B$ can do $60\%$ of the work in $30$ days and $C$ can do $\displaystyle \frac{1}{3}$rd of the work in $15$ days, Who will complete the work first ?

Using the unitary method to find the total time taken by each person to complete the full work, A takes 12 multiplied by 5, which equals 60 days. B completes 60 percent of the work in 30 days, so B takes 30 divided by 0.6, which equals 50 days. C takes 15 multiplied by 3, which equals 45 days. Since C takes the least number of days to finish the work, C will complete it first.

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