Take a 9-meter-long rope, fold it in half, and then fold it in half again. How many meters is each fold?
把一段长9米的绳子，对折以后再对折，每折是多少米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">9 / 4</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>