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If m men can do a work in r days then...

This question belongs to Arithmetic Ability Time And Work
Time and Work
?

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

Answer & Solution
Correct Answer: Option C
M1 × D1 = M2 × D2
mr = (m +n) × D2
D2 = $$\frac{{{\text{mr}}}}{{{\text{m}} + {\text{n}}}}$$
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