A cuboid glass container is 40 cm long, 25 cm wide, and 30 cm high when measured from the inside, and the water surface is 10 cm from the container mouth. How many liters of water are in the container?
一个长方体玻璃容器，从里面量长40cm，宽25cm，高30cm，水面距容器口10cm．容器中的水有多少升？
<gadget id="calculator">30 - 10</gadget>
<output>20</output>

<gadget id="calculator">20 / 1_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">40 * 25 * (1/50)</gadget>
<output>20</output>

<result>20</result>