A batch of goods needs 20 boxes if it is packed in a large container, and 25 boxes if it is packed in a small container. It is known that the large box can hold 200 kg more goods than the small box. Find the weight of this batch of goods in kilograms.
一批货物，如果用大号集装箱要20只箱子，如果用小号集装箱装，要25只箱子，已知大号箱比小号箱可多装货物200千克，求这批货物重多少千克．
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">200 * 4 * 25</gadget>
<output>20_000</output>

<result>20_000</result>