A bundle of wires, using 1/5 of the full length, and then connecting 60 meters, the result is 40% longer than the original, how many meters is the original length of the wire?
一捆电线，用去全长的(1/5)，再接上60米，结果比原来长40%，电线原来长多少米．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/5) - (4/5)</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">60 / (3/5)</gadget>
<output>100</output>

<result>100</result>