a stock of food grain is enough for 500 men for 8 weeks.how long will the samr stock last for 100 men lesser?

We are given that a stock of food grain last for 8 weeks for 500 men.Let the stock lasts for x weeks for 400 men.Clearly, number of weeks varies inversely with the number of men.So, 500 × 8 = 400 × xx = 500×8400 = 10So, the same stock of foodgrain lasts for 10 weeks for 400 men.

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6.4 weeks
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for 10 week solution 500*8=100*x (ans=10week)
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