Cut off (3/4) of a rope, it is exactly 15m, what is the length of this rope in m?
一根绳子剪去它的(3/4)，正好是15m，这根绳子长多少m．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<result>20</result>