The rainwater

The rainwater container has the shape of a block whose bottom has dimensions of 4.5 m and 3.5 m. It is partly filled with water. What is the level if there is 189 hl of water in it?

Correct answer:

h =  1.2 m

Step-by-step explanation:

$$\begin{gathered} a=4.5\text{ m } \\ b=3.5\text{ m } \\ V=189\text{ hl}\to {\text{m}}^3=189\mathrm{/}10{\text{m}}^3=18.9{\text{m}}^3 \\ S=a\cdot b=4.5\cdot 3.5={\displaystyle \frac{63}{4}}=15.75{\text{m}}^2 \\ h=V\mathrm{/}S=18.9\mathrm{/}15.75={\displaystyle \frac{6}{5}}={\displaystyle \frac{6}{5}}\text{ m}=1.2\text{ m} \end{gathered}$$

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