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B can work thrice as much as A can do in a day. If they together can do 4/15 parts of a work in 10 days, in how many days will B finish the work alone?

A. 60 dyas
B. 50 days
C. 15 days
D. 5 days
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সঠিক উত্তরঃ B. 50 days
Explanation: