A steel pipe has 6 meters left after (2/5) of it is used up. How long is the steel pipe in meters?
一根钢管，用去它的(2/5)后还余6米，这根钢管长多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 / (3/5)</gadget>
<output>10</output>

<result>10</result>