There are 800 hens in a chicken farm, and there are fewer roosters than hens (1/4). How many roosters are there?
某养鸡场有母鸡800只，公鸡比母鸡少(1/4)．公鸡有多少只？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">800 * (3/4)</gadget>
<output>600</output>

<result>600</result>