Cut an iron wire into 15 segments on average, use up 5 segments, and the rest account for a fraction of the total length (expressed in the simplest fraction)
把一根铁丝平均剪成15段，用去5段，剩下的占全长的几分之几(用最简分数表示)
<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<gadget id="calculator">10 / 15</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>