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

1 $\frac{m + n}{mn}$ $\frac{{{\text{m}} + {\text{n}}}}{{{\text{mn}}}}$
2 $\frac{m + n}{mr}$ $\frac{{{\text{m}} + {\text{n}}}}{{{\text{mr}}}}$
3 $\frac{mr}{m + n}$ $\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$
4 $\frac{r (m + n)}{mn}$ $\frac{{{\text{r}}\left( {{\text{m}} + {\text{n}}} \right)}}{{{\text{mn}}}}$

Answer:- 1

Explanation:-

Solution:

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

\frac{mr}{m + n}

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

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", "dateCreated": "7/24/2019 10:09:12 AM", "author": { "@type": "Person", "name": "Nitin Sir" } }, "suggestedAnswer": { "@type": "Answer", "text": "

Solution:

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

\frac{mr}{m + n}

$\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$ ", "dateCreated": "7/24/2019 10:09:12 AM" } }

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