1. **State the problem:** Fido eats $1 \frac{1}{3}$ cups of Krispy Kibble per meal. Mum buys the dog food in 20-cup packets. We need to determine if one packet is enough for 15 meals. 2. **Convert mixed number to improper fraction:** $$1 \frac{1}{3} = \frac{3 \times 1 + 1}{3} = \frac{4}{3}$$ cups per meal. 3. **Calculate total food needed for 15 meals:** $$15 \times \frac{4}{3} = \frac{15 \times 4}{3} = \frac{60}{3} = 20$$ cups. 4. **Compare total food needed with packet size:** The packet contains 20 cups, and Fido needs exactly 20 cups for 15 meals. 5. **Conclusion:** There is just enough food in one 20-cup packet for 15 meals. Final answer: Yes, one packet is enough for 15 meals.