A cylindrical cup is filled with 12 liters of water, and an iron cone with the same height as the bottom is placed upside down and submerged in the water, how many liters of water is left in the cup?
一个圆柱体杯中盛满12升水，把一个与它等底等高的铁圆锥倒放浸没于水中，杯中还有多少升水．
<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">12 * (2/3)</gadget>
<output>8</output>

<result>8</result>