The bicycle factory plans to produce 1,500 bicycles in three months, 580 in the first month, 620 in the second month, and how many more in the third month? (answer in two ways)
自行车厂计划三个月生产自行车1500辆，第一个月生产580辆，第二个月生产620辆，第三个月还要生产多少辆？(用两种方法解答)
<gadget id="calculator">1_500 - 580 - 620</gadget>
<output>300</output>

<result>300</result>