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A farmer has food for 14 cows which can last for 39 days. How long would the food last, if 7 more cows join his cattle?

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A farmer has food for 14 cows which can last for 39 days. How long would the food last, if 7 more cows join his cattle?

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Best answer

Inverse variation

k = xy = 14 × 39

No. of cow = 14 + 7 = 21

No. of days = x

21 × x = 14 × 39

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