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On a farm, there are 15 hens, 3 cows and 7 goats. Together they can complete the food grains of 31.15\(kg\) in a day. If a goat eats 2 times hens less than a cow, and the cow eats \(2\) times the goats and a hen. Find the number of grains a hen, a cow and a goat has.
 
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The amount of grains had by a hen is \(kg\).
 
The amount of grains had by a cow is \(kg\).
 
The amount of grains had a goat is \(kg\).