3. If 30 men, working 9 h a day, can reap a
field in 16 days, in how many days, will 36
men reap the field, working 8 h a day?
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Answer:
required number of days be x.
More men, Less days (Indirect proportion)
Less hours, More days (Indirect proportion)
Men 36 : 30
:: 16 : x
Hours/ day 8 : 9
Therefore, (36×8×x)=(30×9×16)
Therefore, x = 30×9×1636×8 = 15 days
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