(3/4) of 12 tons is equal to 20% of that number.
12吨的(3/4)与多少的20%相等．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/4) / (1/5)</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">12 * (15/4)</gadget>
<output>45</output>

<result>45</result>