rope is cut off (1/4), and then 12 meters are connected. Now the length of the rope is longer than the original (1/4). How many meters is the original length of this rope?
一根绳子剪去(1/4)，再接上12米，现在绳子的长度比原来多(1/4)，这根绳子原来长多少米．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

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

<gadget id="calculator">(5/4) - (3/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 / (1/2)</gadget>
<output>24</output>

<result>24</result>