If the radius of the bottom of the cone is enlarged to 3 times and the height is reduced to 1/2 of the original, how much is the volume increased?
圆锥底面半径扩大为原来的3倍，高缩为原来的(1/2)，则体积增加了多少．
<gadget id="calculator">350 / 100</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>