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72. A and B together complete a piece of work in 12 days. A and B start the work together, after'9 days.
B left the work, remaining work is completed by A in 5 days. A and B alone does work in how
many days.
A और B
एक साथ मिलकर एक काम को 12 दिन में समाप्त कर सकते हैं। दोनों एक साथ काम शुरू करते हैं 9 दिनों के बाद B
काम छोड़ देता है, शेष काम को A अकेले 5 दिन में समाप्त करता है । तो A और B अलग-अलग इस काम को कितने दिन में समाप्त
करेंगे ?
(a) 30, 20
(b) 30, 40
(c) 40, 30
(d) 20, 30

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