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10 persons begin to work together on a j...

10 persons begin to work together on a job but after some days 4 persons leave. As a result the job which could have been completed in 40 days is completed in 50 days. How many days after the commencement of the work did the 4 persons leave?

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RS AGGARWAL-TIME AND WORK-All Questions
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  20. A can complete 1/3 of a work in 5 days and B, 2/5 of the work in 10 da...

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