(1/5) cut off by a wooden stick is exactly 2 meters, how many meters is left on this wooden stick?
一根木棒截下它的(1/5)正好是2米，这根木棒还剩多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / (1/5)</gadget>
<output>10</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>