A piece of iron wire, cut off the full length (2/5) for the first time, cut 5 meters more than the first time for the second time, and there are 10 meters left, how long is this wire?
一根铁丝，第一次截取全长的(2/5)，第二次比第一次多截5米，还剩10米，这根铁丝多长？
<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<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">15 / (1/5)</gadget>
<output>75</output>

<result>75</result>