A pile of conical sand has a base area of 20 square meters and a height of 7.5 meters. It is known that each cubic meter of sand weighs 1350 kilograms. How many tons does this pile of sand weigh?
一堆圆锥形的沙子，量得它的底面积是20平方米，高是7.5米，已知每立方米沙重1350千克，这堆沙子有多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 * 7.5 * (1/3)</gadget>
<output>50</output>

<gadget id="calculator">50 / 1_000</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1_350 * (1/20)</gadget>
<output>135/2 = around 67.5</output>

<result>135/2 = around 67.5</result>