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X and Y can do a piece of work in 20 day...

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? `6\ d a y s` b. `\ 10\ d a y s` c. `1\ 5\ d a y s` d. `20\ d a y s`

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