The fuel tank of a car is a cuboid with a length of 30 cm, a width of 25 cm, and a depth of 20 cm. Now fill in 12 liters of gasoline, how many centimeters will the oil level be from the top of the tank?
有一汽车的油箱是长方体，从里面量长30厘米，宽25厘米，深20厘米．现在装进12升的汽油，油面离油箱顶还有多少厘米．
<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<gadget id="calculator">1_000 / 750</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">12 * (4/3)</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<result>4</result>