shoe factory produced 12 days in the first half of July, with an average of 350 pairs of shoes per day, and 13 days in the second half of July, with a total production of 4,500 pairs of shoes. How many pairs of shoes are produced per day on average this month?
某鞋厂7月份上半月生产了12天，平均每天生产350双鞋，下半月生产了13天，共生产了4500双鞋，这个月平均每天生产多少双鞋？
<gadget id="calculator">350 * 12</gadget>
<output>4_200</output>

<gadget id="calculator">4_200 + 4_500</gadget>
<output>8_700</output>

<gadget id="calculator">12 + 13</gadget>
<output>25</output>

<gadget id="calculator">8_700 / 25</gadget>
<output>348</output>

<result>348</result>