A cylindrical container is filled with 27 liters of water. Fill it to the bottom and height of a conical container, how many liters of water are there in the cylindrical container?
圆柱体容器中盛满27升水．把它倒满一个与它等底等高的圆锥体容器，圆柱体容器中还有多少升水．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">27 * (2/3)</gadget>
<output>18</output>

<result>18</result>