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400 persons working 9 hours per day complete 1/4th of the work in 10 days . The number of additional persons , working 8 hours per day required to complete the remaining work in 20 days is:

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400 persons working 9 hours per day complete 1/4th of the work in 10 days . The number of additional persons , working 8 hours per day required to complete the remaining work in 20 days is:






 
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