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 will overflow.
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，将会有多少升水溢出．
<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>