A wire uses (4/5) meters, which is exactly the remaining 25%. How long is this wire originally?
一根电线用去(4/5)米，正好是剩下的25%．这根电线原来长多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) / (1/4)</gadget>
<output>16/5 = around 3.2</output>

<gadget id="calculator">(4/5) + (16/5)</gadget>
<output>4</output>

<result>4</result>