The ratio of big cows to small cows is 4:5, so how much less big cows are there than small cows
大牛和小牛的数量比是4：5，那么大牛的数量比小牛少多少
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

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

<result>1/5 = around 0.2</result>