Divide an iron wire into 5 sections on average, and use up 2 sections, how much of the iron wire is left
把一根铁丝平均分成5段，用去了2段，还剩下这根铁丝的多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 3</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>