Snails

How many liters of water will fit in an aquarium with bottom dimensions of 30 cm and 25 cm and a height of 60 cm if we pour water up to a height of 58 cm? How many snails can we keep in an aquarium if we know that snails need 600 cm³ of water for their life?

Correct answer:

V =  43.5 l
n =  72

Step-by-step explanation:

$$\begin{gathered} a=30\text{cm}\to \text{dm}=30:10\text{dm}=3\text{dm} \\ b=25\text{cm}\to \text{dm}=25:10\text{dm}=2.5\text{dm} \\ c=58\text{cm}\to \text{dm}=58:10\text{dm}=5.8\text{dm} \\ V=a\cdot b\cdot c=3\cdot 2.5\cdot 5.8=43.5\text{l} \end{gathered}$$

$$\begin{gathered} V_1=600{\text{cm}}^3\to \text{l}=600:1000\text{l}=0.6\text{l} \\ n=\lfloor V/V_1\rfloor =\lfloor 43.5/0.6\rfloor =72 \end{gathered}$$

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