rope is folded in half and then folded in half again. Now each fold is 5 meters long. How long is this rope originally?
一根绳子对折之后再对折，现在每折长5米．这根绳子原来有多少米长．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / (1/4)</gadget>
<output>20</output>

<result>20</result>