1. **Stating the problem:** Ayah initially has 3 chickens that consume all the feed in 50 minutes. After adding 7 more chickens, making a total of 10 chickens, we need to find how long it will take for all 10 chickens to finish the same amount of feed. 2. **Formula and concept:** The amount of feed is constant. The time taken to finish the feed is inversely proportional to the number of chickens because more chickens eat faster. We use the formula: $$\text{Time}_1 \times \text{Number of chickens}_1 = \text{Time}_2 \times \text{Number of chickens}_2$$ 3. **Given values:** - $\text{Time}_1 = 50$ minutes - $\text{Number of chickens}_1 = 3$ - $\text{Number of chickens}_2 = 3 + 7 = 10$ 4. **Calculate $\text{Time}_2$:** $$50 \times 3 = \text{Time}_2 \times 10$$ $$150 = 10 \times \text{Time}_2$$ $$\text{Time}_2 = \frac{150}{10} = 15$$ 5. **Answer:** Waktu yang diperlukan untuk 10 ekor ayam menghabiskan pakan adalah 15 menit.