An iron rod is cut off (1/4) of the full length, and then welded to 2 meters, which is exactly 8 meters. How long is this iron rod?
一根铁棒截去全长的(1/4)，再焊接上2米，正好是8米．这根铁棒原来长多少米．
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

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

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">6 / (3/4)</gadget>
<output>8</output>

<result>8</result>