A conical container with a height of 12 cm is filled with water, and all the water is poured into a cylindrical measuring cup with the same height as the bottom, how many centimeters is the water surface from the mouth of the cup.
高12厘米的圆锥形容器里装满了水，把这些水全部倒入与它等底等高的圆柱形量杯内，水面离杯口多少厘米．
<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>