Mathematics
Medium
Question
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
✓ Official correct answer
C
15 days
D
20 days
Community credibility
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A
6 days
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B
10 days
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C
15 days
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D
20 days
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