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16)

A man can do a piece of work in 5 days. With the help of his friend, he can do the same work in 3 days. In how many days can his friend complete the work ?

17)

A can complete a piece of work in 18 days and B can complete the same work in half time taken by A. Then, working together, what part of the same work they can complete in a day?

18)

'A' works twice as fast as 'B'. If both of them can together finish a work in 4 days, then in how many days, B alone can do it?

19)

6 men or 10 women can do a piece of work in 24 days. How long will 12 men and 10 women take to finish the work?

20)

A can do $\frac{1}{2}$ of the work in 5 days and B can do $\frac{2}{5}$ of the work in 10 days. In how many days both A and B together can do the work?

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