Mathematics
Medium
Question
A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it ?
A
40 days
B
50 days
C
60 days
✓ Official correct answer
D
70 days
Community credibility
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A
40 days
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B
50 days
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C
60 days
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D
70 days
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