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Amount of food consumed after 4 days = 20 x 4 = 80 men days
Amount of food remaining after 4 days = (20 x 7) - 80 = 60 men days
Remaining food lasted $\frac{60 \ men \ days}{16 \ men}$ = 3.75 days
raphael answered the question on January 16, 2017 at 09:47
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