Dulal and Tamal can do a piece of work in 70 and 60 days respectively. They began the work together, but Dulal leaves after some days and Tamal finished the remaining work in 47 days. After how many days did Dulal leave?

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7 days

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Question: Dulal and Tamal can do a piece of work in 70 and 60 days respectively. They began the work together, but Dulal leaves after some days and Tamal finished the remaining work in 47 days. After how many days did Dulal leave?Solution:Tamal would have done 47/60 work in 47 days. The remaining work = 13/60 must have been done by Dulak and Tamal together. They can do the whole work in (60 × 70)/(60 + 70) = (60 × 70)/130= 420/13 days.So, they would have done 13/60 work in (420/13) × (13/60) = 7 days. Therefore, Dulal left the work after 7 days.

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রেফারেন্স মাত্র

14 days

16 days

18 days

10 days

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