If m men can do a work in r days, then the number of days taken by (m + n) men to do it is :
\(\frac{{{ \text{m}} + { \text{n}}}}{{{ \text{mn}}}}\)
\(\frac{{{ \text{m}} + { \text{n}}}}{{{ \text{mr}}}}\)
\(\frac{{{ \text{mr}}}}{{{ \text{m}} + { \text{n}}}}\)
\(\frac{{{ \text{r}}\left( {{ \text{m}} + { \text{n}}} \right)}}{{{ \text{mn}}}}\)
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6
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