There are 210 hens in the farm, 38 more than twice the number of roosters. How many roosters are there in the farm?
饲养场有母鸡210只，比公鸡的2倍多38只，饲养场有公鸡多少只？
<gadget id="calculator">210 - 38</gadget>
<output>172</output>

<gadget id="calculator">172 / 2</gadget>
<output>86</output>

<result>86</result>