Aptitude - Time and work - Discussion

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Q.

X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?                         
A. 6 days B. 10 days
C. 15 days D. 20 days

Answer: Option B
Explaination:

 


Discussion

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