1. The problem asks: How many litres of water does the jug contain if the water level is at 150 ml? 2. We know that 1000 milliliters (ml) equals 1 litre (L). 3. To convert 150 ml to litres, use the formula: $$\text{litres} = \frac{\text{milliliters}}{1000}$$ 4. Substitute 150 ml into the formula: $$\text{litres} = \frac{150}{1000}$$ 5. Simplify the fraction: $$\text{litres} = \frac{\cancel{150}}{\cancel{1000}} = 0.15$$ 6. Therefore, the jug contains 0.15 litres of water. This means the water level at 150 ml corresponds to 0.15 litres.