A rope, cut off (1/4) meter, the remaining part is exactly (3/4) of the original full length, how long is this rope?
一根绳子，剪去(1/4)米，剩下的部分刚好是原来全长的(3/4)，这根绳子长多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

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

<result>1</result>