Aquarium

Try to estimate the weight of the water in an aquarium 50cm long and 30cm wide when poured to a height of 25cm. Find the weight of the aquarium's water.

Correct answer:

m =  37.5 kg

Step-by-step explanation:

$$\begin{gathered} a=50\text{cm} \\ b=30\text{cm} \\ c=25\text{cm} \\ V=a\cdot b\cdot c=50\cdot 30\cdot 25=37500{\text{cm}}^3 \\ {V}_1=V\to \text{l}=V:1000\text{l}=37500:1000\text{l}=37.5\text{l} \\ \rho =1\text{kg/l} \\ m=\rho \cdot V_1=1\cdot 37.5=37.5\text{kg} \end{gathered}$$

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