Pruthi and Shakil can complete a work in 20 days and 12 days respectively. Pruthi alone started the work and Shakil joined him after 4 days till the completion of the work. How long did the work last?

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Pruthi and Shakil can complete a work in 20 days and 12 days respectively. Pruthi alone started the work and Shakil joined him after 4 days till the completion of the work. How long did the work last?






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