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1. 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. $\frac{m + n}{mn}$

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

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

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

Solution:

M₁ × D₁ = M₂ × D₂
mr = (m +n) × D₂
D₂ =

\frac{mr}{m + n}

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