How much is 20% of 30 equal to 40?
30的20%相当于40的多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / 40</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">30 * (1/200)</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>