An 18-meter-long rope is folded in half and then folded in half. What is the length of each piece?
一根18米长的绳子，对折再对折后，每段长是多少米
<gadget id="calculator">18 / 4</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>