A cylinder and a cone have the same base area and volume respectively. If the height of the cylinder is 30 cm, how many decimeters is the height of the cone?
一个圆柱与一个圆锥的底面积和体积分别相等，已知圆柱的高是30厘米，则圆锥高多少分米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 / (1/3)</gadget>
<output>90</output>

<gadget id="calculator">90 / 10</gadget>
<output>9</output>

<result>9</result>