## Task 1 - 330711

On a chicken farm, 2500 chickens were kept. At the beginning of a month, there was enough feed for exactly 30 days. After exactly 14 days, 500 chickens were slaughtered. By how many days was the time for which the feed was sufficient extended?
The feed available after 14 days would have lasted for 2500 chickens for another 16 days. For 500 chickens, it would last 5 times as long, i.e., $5 \cdot 16$ days.

For 2000 chickens, it would last $\frac{1}{4}$ of this $5 \cdot 16$ days, i.e., $5 \cdot 4=20$ days. Compared to 16 days, it lasts 4 days longer.