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A and B together can complete a task in 20 days. B and C together can complete the same task in 30 days. A and C together can complete the same task in 30 days....
Solution
Given that B and C together can complete the task in 30 days.
Given that A and C together can complete the same task in 30 days.
⇒ The Rate of doing work of A and B is same.
Since A and B together can complete a task...
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