On average, each cow produces 12 kilograms of milk per day. How many kilograms of milk will the 28 cows produce in 2 days?
平均每头奶牛每天产奶12千克，28头奶牛2天一共产奶多少千克．
<gadget id="calculator">12 * 28 * 2</gadget>
<output>672</output>

<result>672</result>