If 3 ducklings eat 42 grams of feed for a week, how many grams of feed does 1 duckling eat in a day?
3只小鸭子一周吃了42克饲料，则1只小鸭子1天吃多少克饲料．
<gadget id="calculator">42 / 3 / 7</gadget>
<output>2</output>

<result>2</result>