After a football is dropped from a high place, the height of each bounce is (2/5) of the height of the previous drop. If the soccer ball is dropped from a height of 20 meters, what is the height of the second bounce?
一个足球从高处落下后，每次弹起的高度是前一次落下高度的(2/5)．如果这个足球从20米的高度落下，第二次弹起的高度是多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5) * (2/5)</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>