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For 9 cows, 13 kg 500 g of food supplement are required every day. In the same proportion, how much will be needed for 12 cows?

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Let the food supplement required for 12 cows be x kg. 

The quantity of food supplement required and the number of cows are in direct proportion.

∴ The food supplement required for 12 cows is 18 kg.

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