The volume of a cylinder is 10 cubic decimeters. What is the volume in cubic decimeters when the radius of its base is doubled and its height becomes 1/2 of the original?
一个圆柱的体积是10立方分米．当它的底面半径扩大2倍，高变为原来的(1/2)时，体积变成多少立方分米．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>