10 people can build a wall in 12 days. Six people, each only half as efficient as those in the first group, will be able to complete $$\frac{3}{5}$$ of such a wall in:
The correct option is A.
 let the total work is 5 units.
 $$\frac{M_{1}\times D_{1}\times eff_{1}}{w_{1}}$$ = $$\frac{M_{2}\times D_{2}\times eff_{2}}{w_{2}}$$
$$\implies$$Â $$\frac{10\times 12\times 2}{5}$$ =Â $$\frac{6\times D_{2}\times 0.5}{3}$$
$$\implies$$ $$D_{2}$$ = 24 days.
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