It is known that chickens are 20% less than ducks, so how much more ducks are than chickens
已知鸡比鸭少20%，那么鸭比鸡多多少
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>