Explanation:

- Initial Solution: 20 liters with a milk and water ratio of 2:3.

- Milk = \( \frac{2}{5} \times 20 = 8 \) liters

- Water = \( \frac{3}{5} \times 20 = 12 \) liters

- Second Solution: 18 liters with a milk and water ratio of 4:5.

- Milk = \( \frac{4}{9} \times 18 = 8 \) liters

- Water = \( \frac{5}{9} \times 18 = 10 \) liters

- Combined Solution:

- Total milk = 8 + 8 = 16 liters

- Total water = 12 + 10 = 22 liters

- Ratio of Milk to Water:

- 16:22 simplifies to 8:11

- Options Review:

1. 16:24

2. 24:16

3. 8:11

4. 11:8

5. None of these