Measuring aquarium

The aquarium has the shape of a block measuring 80 cm, 30 cm, and 20 cm. The water level reaches 6 cm below the upper edge. How many liters of water are in the aquarium? (1 liter = 1 dm³)

Final Answer:

V =  33.6 l

Step-by-step explanation:

$$\begin{gathered} a=80\text{cm}\to \text{dm}=80:10\text{dm}=8\text{dm} \\ b=30\text{cm}\to \text{dm}=30:10\text{dm}=3\text{dm} \\ c=20\text{cm}\to \text{dm}=20:10\text{dm}=2\text{dm} \\ {c}_1=6\text{cm}\to \text{dm}=6:10\text{dm}=0.6\text{dm} \\ V=a\cdot b\cdot (c-c_1)=8\cdot 3\cdot (2-0.6)=33.6\text{l} \end{gathered}$$

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