The No. 2 oil depot of a gas station was originally filled with gasoline, and after half of it was used up, another 3000 liters was added. How many liters of gasoline can this oil depot hold?
一个加油站的二号油库原来装满汽油，用去一半后，又补充了3000升，这时油库的油占油库容量的(4/5)．这个油库能装汽油多少升？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3_000 / (3/10)</gadget>
<output>10_000</output>

<result>10_000</result>