A wire is used 60% and then connected to 13 meters, the current wire is longer than the original (1/20). How many meters did you use?
一根电线用去60%后再接上13米，现在的电线比原来长(1/20)．用去多少米？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/20) - (3/5)</gadget>
<output>-11/20 = around -0.55</output>

<gadget id="calculator">1 + (-11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">13 / (9/20)</gadget>
<output>260/9 = around 28.888889</output>

<gadget id="calculator">(260/9) * (3/5)</gadget>
<output>52/3 = around 17.333333</output>

<result>52/3 = around 17.333333</result>