steel pipe, (1/4) of it is used up for the first time, and (3/4) meter is used up for the second time, exactly half of the steel pipe is used up twice, how long is the steel pipe originally?
一根钢管，第一次用去它的(1/4)，第二次用去(3/4)米，两次正好用了钢管的一半，这根钢管原来长多少米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

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

<result>3</result>