In a workshop of Guanghua Machinery Factory, 15 people were originally planned to make 900 parts in 3 days. After the production started, another batch of tasks were added. With the same work efficiency, it would take 10 people to complete in 8 days. How many parts were added?
光华机械厂一个车间，原计划15人3天做900个零件，生产开始后，又增加一批任务，在工作效率相同下，要10个人8天完成，问增加了几个零件？
<gadget id="calculator">900 / 15 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 * 10 * 8</gadget>
<output>1_600</output>

<gadget id="calculator">1_600 - 900</gadget>
<output>700</output>

<result>700</result>