Question

6 men can complete the electric fitting in a building in 7 days. How many days will it take if 21 men do the job?

Answer 1

$$\begin{gathered} \mathrm{It}\mathrm{is}\mathrm{given}\mathrm{that}6\mathrm{men}\mathrm{can}\mathrm{complete}\mathrm{a}\mathrm{job}\mathrm{in}7\mathrm{days}. \\ \therefore \mathrm{Time}\mathrm{taken}\mathrm{by}1\mathrm{man}\mathrm{to}\mathrm{complete}\mathrm{the}\mathrm{same}\mathrm{job}=\left(6\times 7\right)=42\mathrm{days} \\ \therefore \mathrm{Time}\mathrm{taken}\mathrm{by}21\mathrm{men}\mathrm{to}\mathrm{complete}\mathrm{the}\mathrm{same}\mathrm{job}=\frac{42}{21}=2\mathrm{days} \end{gathered}$$