If m men can do a work in r days, then the number of days taken by (m + n) men to do it is :

A. $$\frac{{{\text{m}} + {\text{n}}}}{{{\text{mn}}}}$$

B. $$\frac{{{\text{m}} + {\text{n}}}}{{{\text{mr}}}}$$

C. $$\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$$

D. $$\frac{{{\text{r}}\left( {{\text{m}} + {\text{n}}} \right)}}{{{\text{mn}}}}$$

Answer: Option C

Solution(By Examveda Team)

M₁ × D₁ = M₂ × D₂
mr = (m +n) × D₂
D₂ = $$\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$$