Farmers have enough food to feed livestock animals for 6 days. If there are animals left in the cow, how long will the feed last?

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Detailed Solution

Concept: The number of days the food is available is inversely proportional to the number of animals. As the number of animals increases, the number of days with sufficient food decreases. Therefore, the number of days the food is available is inversely proportional to the number of animals. If the number of days we receive exceeds 6 days for 30 animals, our answer is wrong. Must be less than 6 days.
Suppose the farmer has enough food to feed 20 livestock animals for 6 days.
The number of days you can feed is X. The farmer now has enough feed to feed 20 animals in 6 days. The farmer then added another 10 animals to the cow.
Currently, the total number of livestock is 30.
Therefore, it is necessary to find out how many days 30 animals can use the food.
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