A pile of conical sand has a base radius of 3 meters and a height of 15 decimeters. Each cubic meter of sand weighs 1.5 tons. How many tons does this pile of sand weigh?
一堆圆锥形沙，底面半径是3米，高15分米，每立方米沙重1.5吨，这堆沙重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">(1/3) * 3.14 * 9 * 1.5 * 1.5</gadget>
<output>21.195</output>

<result>21.195</result>