Fold a 12-meter-long rope in half, and then fold it in half again. How many meters is each fold?
把一根12米长的绳子对折，再对折，每折长多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 * (1/4)</gadget>
<output>3</output>

<result>3</result>