A piece of wood, Xiao Pang used (1/5) of it to make a clothes hanger, and (2/5) of it to make a picture frame, how much of this piece of wood is left.
一根木条，小胖用它的(1/5)做了一个衣架，又用它的(2/5)做了一个镜框，还剩下这根木条的多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>