A piece of wood is 125cm long, 20% is used for the first time, and the rest (1/5) is used for the second time, how many meters are left?
一根木料长125cm，第一次用去20%，第二次用去余下的(1/5)，还剩多少米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">125 * (1/5)</gadget>
<output>25</output>

<gadget id="calculator">125 - 25</gadget>
<output>100</output>

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

<gadget id="calculator">100 * (1/5)</gadget>
<output>20</output>

<gadget id="calculator">125 - 25 - 20</gadget>
<output>80</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>