Fewpal
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A and B can separately finish a piece of work in 20 days and 15 days respectively. They worked together for 6 days, after which B was replaced by C. If the work was finished in next 4 days, then the number of days in next 4 days, then the number of days in which C along could do the work is: 

(a) 60 days 

(b) 40 days 

(c) 50 days 

(d) 30 days

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Correct option (b) 40 days

Explanation:

According to the question

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