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As initially there was provision of food for 50 days for 2100 men, Initial quantity of food = 2100 × 50 = 105000 units. Food consumed in 10 days = 2100 × 10 = 21000 units Food remained after 10 days = 105000 – 21000 = 84000 units. Now, 84000 units of food is sufficient for 50 days for remaining men ⇒ Number of remaining men = 84000/50 = 1680 ∴ The number of men left = 2100 – 1680 = 420
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