How many bottles each holding 1/4 litre can be filled from 7 1/2 litres

How many bottles each holding 1/4 litre can be filled from 7 1/2 litres

$$7 \frac{1}{2} \text{ litres} \\\\ =\frac{15}{2}\text{ litres} \\\\ =\frac{15}{2}*\frac{2}{2} \text{ litres} \\\\ =\frac{30}{4} \text{ litres} \\\\ =30\times \frac{1}{4} \text{ litres}$$

30 bottles