A rectangular tank measuring 32.5 cm by 22.5 cm by 18 cm was $\frac{5}{9}$-filled with water as shown below. When Kamala poured 7 litres of water into the tank, some water overflowed. Find the volume of water that overflowed. Give your answer in litres. Ans: ___

1. Calculate the total capacity of the rectangular tank

$\text{Capacity} = 32.5 \times 22.5 \times 18 = 13162.5 \text{ cm}^3$

2. Find the volume of the empty space in the tank

$\text{Fraction of empty space} = 1 - \frac{5}{9} = \frac{4}{9}$
$\text{Volume of empty space} = \frac{4}{9} \times 13162.5 = 5850 \text{ cm}^3$

3. Calculate the volume of water that overflowed and convert to litres

$\text{Volume of water added} = 7 \text{ litres} = 7000 \text{ cm}^3$
$\text{Volume overflowed} = 7000 - 5850 = 1150 \text{ cm}^3$
$\text{Volume in litres} = \frac{1150}{1000} = 1.15 \text{ litres}$