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 ?

X and Y can do a piece of work in 20 days and 12 days respectively. X

1.	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» C. 15 days

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