If a rope is folded in half twice, its length is 16 meters. If it is folded in half four times, what is the length of each section?
一根绳子对折2次后长度为16米，如果对折4次后每段的长度为多少米．
<gadget id="calculator">2 ** 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 16</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 * (1/4)</gadget>
<output>4</output>

<result>4</result>