100 pieces of the same small stones are put into a water glass with a length of 20 cm, a width of 5 cm, and a depth of 4 cm. The water level rises by 3 cm. What is the approximate cubic centimeter of each small stone?
100块同样的小石头放进一个长20厘米，宽5厘米，深4厘米的水杯里，水面上升了3厘米，每块小石头大约多少立方厘米？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">20 * 5 * (3/100)</gadget>
<output>3</output>

<result>3</result>