If 30 workers working 7 hours a day can do a piece of work in 18 days in how many days will 21 workers working 8 hours a day do the same work ? A. 24 days B. 22.5 days C. 30 days Di. 45 days
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no of days = (30×7×18)÷(21×8)=45/2 days = 22.5 days
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