There is an iron wire whose length ratio is 1:2.5 to the remaining length, and then 20 meters are cut off from the remaining length. The ratio of the length of the two cuts to the remaining length is 2:2.5. How long is this wire in meters?
有一根铁丝截去的和剩下的长度比是1：2.5，再从余下的截去20米，两次截去的和余下的长度比是2：2.5，这根铁丝长多少米？
<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(5/7) - (5/9)</gadget>
<output>10/63 = around 0.15873</output>

<gadget id="calculator">20 / (10/63)</gadget>
<output>126</output>

<result>126</result>