A 3 meter long rope is folded twice, what is the length of each length?
把3米长的一根绳子对折两次，每一段是多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * (1/2) * (1/2)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>