A cylinder 4 decimeters high has a volume of 40 cubic decimeters, which is 10 cubic decimeters larger than that of a cone with the same base. What is the height of the cone in decimeters.
一个圆柱体高4分米，体积是40立方分米，比与它等底的圆锥体的体积多10立方分米．这个圆锥体的高是多少分米．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">40 - 10</gadget>
<output>30</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 * (3/10)</gadget>
<output>9</output>

<result>9</result>