Xiaoli's family has 3 cows, and the milk production in the first half of December last year (15 days) was 945 kg. How many kilograms of milk does the average cow produce per day?
小莉家养了3头奶牛，去年12月份上半月(15天)的产奶量是945千克．平均每头奶牛每天的产奶量是多少千克？
<gadget id="calculator">945 / 15 / 3</gadget>
<output>21</output>

<result>21</result>