A piece of iron wire, its (1/3) and (1/3) meter is used for the first time; the remaining (1/4) and (1/4) meter is used for the second time; it is used for the third time (1/2) and (1/2) meters at the time, and finally (1/4) meters are left. How many meters was this wire originally?
一根铁丝，第一次用去它的(1/3)又(1/3)米；第二次用去余下的(1/4)又(1/4)米；第三次用去这时的(1/2)又(1/2)米，最后还剩下(1/4)米．这根铁丝原来有多少米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/4) + (1/2)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/4) / (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) + (1/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(7/4) / (3/4)</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(7/3) + (1/3)</gadget>
<output>8/3 = around 2.666667</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(8/3) / (2/3)</gadget>
<output>4</output>

<result>4</result>