Discussion

If a rectangular tank is 21cm long, 13cm wide and 18cm high and contains water up to a height of 11cm then volume of water in liters is

Answer: C

Only the water is wanted, so use its own height of 11 cm rather than the tank's 18 cm.

\[ V = 21 \times 13 \times 11 = 3003 \text{ cm}^{3} \]

Since \( 1000 \text{ cm}^{3} = 1 \) litre:

\[ V = \frac{3003}{1000} = 3.003 \text{ litres} \]

Using the full 18 cm depth would give 4.914 litres - the tank's capacity, not the water it holds.

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