A cylinder and a cone have the same base and height, and the sum of their volumes is 12 cubic meters. What is the volume of this cylinder in cubic meters?
一个圆柱和一个圆锥等底等高，体积之和是12立方米，这个圆柱的体积是多少立方米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">12 / (4/3)</gadget>
<output>9</output>

<result>9</result>