In the first quarter, 264 copies of "Youth Literature and Art" were sold, and in the second quarter, 240 copies of "Youth Literature and Art" were sold. How many copies of "Youth Literature and Art" were sold on average every month?
第一季度卖出《少年文艺》264本，第二季度卖出《少年文艺》240本，平均每月卖出《少年文艺》多少本？
<gadget id="calculator">264 + 240</gadget>
<output>504</output>

<gadget id="calculator">504 / 6</gadget>
<output>84</output>

<result>84</result>