long rope, cut off 25% of it for the first time, and cut 0.5 meters more than the first time for the second time, leaving 8 meters left. How long is this rope? (Draw a line segment diagram and then answer)
一根长绳，第一次剪去它的25%，第二次比第一次多剪0.5米，还剩8米．这根绳原来长多少米？(画出线段图再解答)
<gadget id="calculator">8 + 0.5</gadget>
<output>8.5</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8.5 / (1/2)</gadget>
<output>17</output>

<result>17</result>