A conical pile of grain is 1.8 meters high and the diameter of the bottom is 20 meters. If every 5 cubic meters of grain weighs about 4 tons, how many tons does this pile of grain weigh?
一个近似圆锥的粮食堆，高1.8米，底面直径是20米，如果每5立方米粮食约重4吨，这堆粮食重多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/3) * 3.14 * 100 * 1.8 * (4/5)</gadget>
<output>150.72</output>

<result>150.72</result>