Grandma Wang's family has 6 big fat pigs. They eat 168 kilograms of food a week (7 days). How many kilograms of food does each big fat pig eat on average per day?
王奶奶家养了6头大肥猪，它们一周(7天)吃了168千克食物，平均每头大肥猪每天吃多少千克食物？
<gadget id="calculator">168 / 6 / 7</gadget>
<output>4</output>

<result>4</result>