Mathematics
Medium
Question
A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?
A
80 days
B
100 days
C
120 days
✓ Official correct answer
D
150 days
Community credibility
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A
80 days
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B
100 days
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C
120 days
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D
150 days
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