A rope, after being folded twice, measures (5/13) meters, how long is the rope in meters?
一根绳子，对折两次后量得是(5/13)米，这根绳子长多少米．
<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<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">(5/13) / (1/4)</gadget>
<output>20/13 = around 1.538462</output>

<result>20/13 = around 1.538462</result>