A chicken farm collects 18 kilograms of eggs in a box on Monday. After packing 21 boxes, there are still 16 kilograms left. How many kilograms of eggs does this chicken farm collect on Monday?
一个养鸡场星期一收的鸡蛋，18千克装一箱，装了21箱后，还剩下16千克，这个养鸡场星期一收了多少千克鸡蛋？
<gadget id="calculator">18 * 21</gadget>
<output>378</output>

<gadget id="calculator">378 + 16</gadget>
<output>394</output>

<result>394</result>