Water tank

In an empty fire tank, 2150 hl of water jetted in 5 hours. How many hectoliters of water was jetted every hour? How many hectoliters of water was in the tank after three hours?

Correct result:

a =  430 hl
b =  1290 hl

Solution:

$$\begin{gathered} t=2150\text{ hl } \\ a=t\mathrm{/}5=2150\mathrm{/}5=430\text{ hl} \end{gathered}$$

$b=3\cdot a=3\cdot 430=1290\text{ hl}$

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