A can process 20 parts per hour, and B can process 25 parts per hour. The two work together to process 1800 such parts at the same time. How many more parts does B process than A?
甲每小时可加工零件20个，乙每小时可以加工零件25个，两人同时共同加工这样的零件1800个，完工时乙比甲多加工了多少个？
<gadget id="calculator">20 + 25</gadget>
<output>45</output>

<gadget id="calculator">1_800 / 45</gadget>
<output>40</output>

<gadget id="calculator">25 * 40</gadget>
<output>1_000</output>

<gadget id="calculator">20 * 40</gadget>
<output>800</output>

<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<result>200</result>