wire, 20% of it is used for the first time, and the rest (1/4) is used for the second time, leaving 48 meters. How many meters of this wire is used for the first time?
一条电线，第一次用去它的20%，第二次用去剩下的(1/4)，还剩48米，这根电线第一次用去多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">48 / (3/5)</gadget>
<output>80</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">80 * (1/5)</gadget>
<output>16</output>

<result>16</result>