A wire uses 10 meters, and the rest is 5 meters longer than the original (2/5), how many meters is the original wire?
一根电线用去10米，余下的比原来的(2/5)多5米，这根电线原有多少米？
<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)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">15 / (3/5)</gadget>
<output>25</output>

<result>25</result>