There are 28 roosters in the farm, and 9 hens are 3 times more than the number of roosters. How many hens are there in the farm?
饲养场养了公鸡28只，养的母鸡只数比公鸡的3倍多9只，饲养场养的母鸡有多少只？
<gadget id="calculator">28 * 3</gadget>
<output>84</output>

<gadget id="calculator">84 + 9</gadget>
<output>93</output>

<result>93</result>