For a piece of cloth, if (3/4) of it is used, it is exactly 12 meters; if (5/8) of it is used, how many meters are used.
一段布，用去它的(3/4)，正好是12米；若用去它的(5/8)，则用去多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 / (3/4)</gadget>
<output>16</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">16 * (5/8)</gadget>
<output>10</output>

<result>10</result>