There are 400 dairy cows in a certain farm, and the number of dairy cows is less than that of beef cattle (1/5). How many beef cattle are there in this farm?
某农场有奶牛400头，奶牛的头数比肉牛少(1/5)，这个农场有肉牛多少头？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">400 / (4/5)</gadget>
<output>500</output>

<result>500</result>