12 kg (2/5) is 8 kg.
12千克的(2/5)是8千克的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 8</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">12 * (1/20)</gadget>
<output>3/5 = around 0.6</output>

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