A cylindrical cup is filled with 15 liters of water, and an iron cone with the same height as its bottom is poured into the water, how many liters of water is left in the cup?
一个圆柱体杯中盛满15升水，把一个与它等底等高的铁圆锥倒放入水中，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">15 * (2/3)</gadget>
<output>10</output>

<result>10</result>