Xiaoli's home is 600 meters away from the school. When Xiaoli walked 200 meters to school, she realized that she forgot to bring her homework. She went home to pick up her homework and rushed to school. How many meters did she walk to school today?
小丽家离学校600米．小丽上学走了200米时，发现忘记带作业本．她回家取了作业本后赶到学校，她今天上学共走了多少米？
<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<gadget id="calculator">600 + 400</gadget>
<output>1_000</output>

<result>1_000</result>