Two ropes of the same length, the first one is folded in half once, and then cut from the middle; the second rope is folded in half three times, and then cut from the middle. It is known that among the cut ropes, the difference between the longest and the shortest two ropes is 7.7 meters, find the original length of each rope.
两根同样长的绳子，第一根对折1次，然后从中间剪开；第二根对折3次，然后也从中间剪开．已知剪断后的绳子中，最长的与最短的两段绳子相差7.7米，求原来每根绳子的长度．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/2) - (1/16)</gadget>
<output>7/16 = around 0.4375</output>

<gadget id="calculator">7.7 / (7/16)</gadget>
<output>17.6</output>

<result>17.6</result>