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a) $$\frac{{{\text{m}} + {\text{n}}}}{{{\text{mn}}}}$$ b) $$\frac{{{\text{r}}\left( {{\text{m}} + {\text{n}}} \right)}}{{{\text{mn}}}}$$ c) $$\frac{{{\text{m}} + {\text{n}}}}{{{\text{mr}}}}$$ d) $$\frac{{{\text{mr}}}}{{{\text{m}} + ...

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If 3 men or 4 women can plough a field in 43 days, how long will 7 men and 5 women take to plough it?

If 2 men or 3 women or 4 boys can do a piece of work in 52 days, then the same piece of work will be done by 1 man, 1 woman and 1 boy in:

If 10 persons can do a job in 20 days, then 20 person with twice the efficiency can do the same job in:

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

Two persons having different productivity of labour, working together can reap a field in 2 days. If one-third of the field was reaped by the first man and rest by the other one working alternatively took 4 days. How long did it take for the faster person to reap the whole field working alone?

A group of men decided to do a job in 4 days. But since 20 men dropped out every day, the job completed at the end of the 7^th day. How many men were there at the beginning?

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 20hr. If all pipes are opened simultaneously, then the cistern will be filled in:

A is thrice good a workman as B and therefore is able to finish a job in 40 days less than B. Working together they can do it in :

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