A wire uses up the full length (1/5) for the first time, and 4.5 meters more than the first time, and there are 10.5 meters left. How long is the wire?
一根电线第一次用去全长的(1/5)，第二次比第一次多用了4.5米，还剩10.5米，这根电线长多少米？
<gadget id="calculator">4.5 + 10.5</gadget>
<output>15</output>

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

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

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

<result>25</result>