After a rope is folded in half, its length (1/2) is 1 meter. What is the original length of the rope?
一根绳子对折后，这时它的长度的(1/2)是1米，这根绳子原来长多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

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

<result>4</result>