Cuboid aquarium

Cuboid 25 times 30 cm. How long is third side if cuboid contains 30 liters of water?

Correct answer:

c =  40 cm

Step-by-step explanation:

$$\begin{gathered} a=25\text{ cm } \\ b=30\text{ cm } \\ V=30\text{ l}\to {\text{cm}}^3=30\cdot 1000{\text{cm}}^3=30000{\text{cm}}^3 \\ V=a\cdot b\cdot c \\ c={\displaystyle \frac{V}{a\cdot b}}={\displaystyle \frac{30000}{25\cdot 30}}=40\text{ cm} \end{gathered}$$

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