A and B can do a work in 12 days. B and C can do it in 15 days. A and C can do it in 20 days. If all of them work together, in how many days can they finish the work?

Created 1 year ago | Updated 4 hours ago
(ক) 9
(খ) 10
(গ) 12
(ঘ) 15
No explanation available.

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