cylinder with a height of 4 decimeters and a volume of 40 cubic meters is 10 cubic decimeters larger than the volume of a cone with the same base as it. What is the height of this cone in decimeters?
一个圆柱高4分米，体积是40立方米，比与它等底的圆锥的体积多10立方分米，则这个圆锥的高是多少分米．
<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>