Lushan Township has about 30,000 people, and Dongjiang Township has about 10,000 fewer people than Lushan Township. How many people are there in Dongjiang Township?
芦山乡约有30000人，东江乡比芦山乡约少10000人东江乡约有多少人？
<gadget id="calculator">30_000 - 10_000</gadget>
<output>20_000</output>

<result>20_000</result>