wire is used up (2/5) meters, and the rest is longer than the used one (1/4) meter, how many meters is this wire originally?
一根电线用去(2/5)米，剩下的比用去的长(1/4)米，这根电线原来长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) + (1/4) + (2/5)</gadget>
<output>21/20 = around 1.05</output>

<result>21/20 = around 1.05</result>