The chickens in the chicken farm can eat 108 kilograms of food in 3 days. According to this way of eating, how many kilograms of food can these chickens eat in a week?
养鸡场的鸡3天能吃108千克食物．按这种吃法，这些鸡一个星期能吃食物多少千克？
<gadget id="calculator">108 / 3</gadget>
<output>36</output>

<gadget id="calculator">36 * 7</gadget>
<output>252</output>

<result>252</result>