If 30 men working 7 hours per day can do a work in 18 days in how many days will 21 men working 8 hours a day do the same work?
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the work is completed and again why should the workers work
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Give required days a chance to be n. 30 × 7 × 18 = 21 × 8 × n = 30 × 7/21 × 18/8 = 180/8 = 45/2 days.
Work =Men × hr/day×days Work is same in the two cases Let 48 men will finish a similar work in x hr/day 20×8hr/day×21=48×x hr/day×7 48x=(20×8×21)/7 48x=20×8×3 x=(20×8×3)/48 x=480/48 x=10
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