X and Y can do a piece of work in 20 days and 12 days res... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

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 ?

Correct answer: B

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