Water level

In the pool, which is 15 m long, 6 m wide, and 2 m deep, the water level is 20 cm below the edge. How many hectoliters of water are in the pool?

Correct answer:

V =  1620 hl

Step-by-step explanation:

$$\begin{gathered} a=15\text{m} \\ b=6\text{m} \\ {c}_1=2\text{m} \\ {c}_2=20\text{cm}\to \text{m}=20:100\text{m}=0.2\text{m} \\ c=c_1-c_2=2-0.2=\frac{9}{5}=1.8\text{m} \\ {V}_1=a\cdot b\cdot c=15\cdot 6\cdot 1.8=162{\text{m}}^3 \\ V=V_1\to \text{hl}=V_1\cdot 10\text{hl}=162\cdot 10\text{hl}=1620\text{hl}=1620\text{hl} \end{gathered}$$

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