Tank gasoline remaining

The tank originally had 7 m³ of gasoline. We gradually pumped out 3 hl, 3000 dm³, and 700 liters of gasoline. How many liters of petrol is left in the tank?

Final Answer:

V =  3000 l

Step-by-step explanation:

$$\begin{gathered} V_1=7{\text{m}}^3\to \text{l}=7\cdot 1000\text{l}=7000\text{l} \\ {V}_2=3\text{hl}\to \text{l}=3\cdot 100\text{l}=300\text{l} \\ {V}_3=3000{\text{dm}}^3\to \text{l}=3000\cdot 1\text{l}=3000\text{l} \\ {V}_4=700\text{l} \\ V=V_1-V_2-V_3-V_4=7000-300-3000-700=3000\text{l} \end{gathered}$$

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