A container contains 450 litres of a mixture that contains 30\% of soda and the rest is water. If 45 litres of water is added to it then what is the ratio of soda and water in the new mixture?

The mixture initially has 450 liters with 30% soda (135 liters) and 70% water (315 liters). After adding 45 liters of water, we have 135 liters soda and 360 liters water. The ratio is 135:360, which simplifies to 3:8 (divide both by 45). Option D is correct. Options A (2:3), B (5:8), and C (3:5) don't match this calculation.