The air conditioner factory produced 720 air conditioners in the first quarter and 990 air conditioners in the second quarter. How many air conditioners were produced per month on average in the first half of the year?
空调器厂第一季度生产空调720台，第二季度生产空调990台，空调上半年平均每月生产多少台空调？
<gadget id="calculator">720 + 990</gadget>
<output>1_710</output>

<gadget id="calculator">1_710 / 6</gadget>
<output>285</output>

<result>285</result>