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At a filling rate of 30 L/min, the water added after 40 minutes is $30 imes 40 = ____$ liters.
When the initial amount of water is 400 liters and the flow rate is 15 L/min, after 10 minutes, $Q(10) = 400 + ____$ liters.
The formula to find the amount of water after time $t$ is $Q(t) = Q_0 \pm ____ t$.
For a draining scenario, the formula used is $Q(t) = Q_0 - ____$.
If a tank starts with 200 gallons and is drained at $-5$ gal/min, how much water remains after 20 minutes? $Q(20) = 200 + ____$ gallons.
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