A cylinder and a cone have the same base and height, and the sum of their volumes is 40 cubic centimeters. What is the volume of the cylinder in cubic centimeters?
一个圆柱和一个圆锥等底等高，它们的体积和是40立方厘米，圆柱的体积是多少立方厘米．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

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

<result>30</result>