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1)X and Y can do a piece of work in 18 days.Y and Z cand do it in 24 days
If X is 2 times as good as Z,find in what time Y alone can do it?

2) X,Y,Z together can complete a work in 24 days, X and Z together can do 2 times as much as Y does. Also, X and Y can do 3 times as much as Z does. Find the time taken by each one to complete the work?

3) X does half as much work as Y in (1/3)rd of the time. If together they take 20 days to finish a job, how much days shall Y take to do it?

4) X,Y and Z together can earn money Rs.270 per day while X and Z together earn money Rs.115 and Y and Z together can earn money Rs.167. What is the daily earnings of Z?

5) If 6 guys or 12 girls can do a piece of work in 21 days. Then in how many days 5 guys and 8 girls will do the same work?

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