The radius of the base of a cone-shaped sand pile is 3 meters, and the height is 2.5 meters. How many meters can be paved with this pile of sand on a road with a width of 5 meters and a thickness of 4 cm? (solution by equation)
一个圆锥形沙堆的底面半径是3米，高是2.5米，用这堆沙子在5米宽的公路上铺4厘米厚的路面，可以铺多少米？(用方程解)
<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 * 2.5</gadget>
<output>23.55</output>

<gadget id="calculator">5 * 0.04</gadget>
<output>0.2</output>

<gadget id="calculator">23.55 / 0.2</gadget>
<output>117.75</output>

<result>117.75</result>