A rope, minus (2/5), the remaining 3 meters more than the cut, how long is the rope in meters?
一根绳子，减去(2/5)，剩下的比剪去的多3米，这根绳子长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / (1/5)</gadget>
<output>15</output>

<result>15</result>