Fold a 1.8-meter-long rope in half, and then fold it in half again. What is the length of each section in meters?
把1.8米长的绳子对折，再对折，每段长是多少米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">1.8 / 4</gadget>
<output>0.45</output>

<result>0.45</result>