The volume of a cylindrical bucket is 36dm**3, the area of the bottom is 4dm**2, filled with (2/3) bucket of water, how much is the distance in dm from the water surface to the mouth of the bucket.
一个圆柱形水桶的容积是36dm**3，底面积是4dm**2，装了(2/3)桶水，水面距桶口有多少dm．
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9 * (1/3)</gadget>
<output>3</output>

<result>3</result>