A piece of iron wire is cut off (1/5) meter for the first time, and (2/5) meter is cut off for the second time, and there is still (1/5) meter left. How many meters is this wire originally?
一根铁丝，第一次截下(1/5)米，第二次截下(2/5)米，还剩(1/5)米，这根铁丝原来有多少米？
<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">(1/5) + (2/5) + (1/5)</gadget>
<output>4/5 = around 0.8</output>

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