A cylinder and a cone have the same base and height, and the sum of their volumes is 124cm**3, what is the volume of the cone?
一个圆柱体和一个圆锥体等底等高，它们的体积之和是124cm**3，那么圆锥的体积是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">124 / 4</gadget>
<output>31</output>

<result>31</result>