A wire is 15 meters long, which is exactly 4 meters longer than the rest. What fraction of the total length of the wire has been used?
一根电线用去了15米，比余下的正好长4米，这根电线已经用去了全长的几分之几？
<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<gadget id="calculator">11 + 15</gadget>
<output>26</output>

<gadget id="calculator">15 / 26</gadget>
<output>15/26 = around 0.576923</output>

<result>15/26 = around 0.576923</result>