One ton of coal (2/5) is equal to five tons of coal.
一吨煤的(2/5)，等于五吨煤的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 5</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">1 * (2/25)</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>