Warehouse A originally had 1 ton of goods, and Warehouse B originally had 900 kilograms of goods. How many kilograms of goods can be transferred from Warehouse A to Warehouse B to make the quality of the goods in the two warehouses equal?
甲仓库原有1吨货物，乙仓库原有900千克货物，从甲仓库调给乙仓库多少千克货物，就能使两个仓库的货物质量相等？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 + 900</gadget>
<output>1_900</output>

<gadget id="calculator">1_900 / 2</gadget>
<output>950</output>

<gadget id="calculator">1_000 - 950</gadget>
<output>50</output>

<result>50</result>