The department store shipped 3,500 soft-covered copies in November. After half a month of selling, there are still 650 copies left. How many copies are sold in the mall on average every day?
百货商场11月份运来3500本软面抄，卖了半个月后，还剩下650本，商场平均每天卖出多少本？
<gadget id="calculator">3_500 - 650</gadget>
<output>2_850</output>

<gadget id="calculator">2_850 / 15</gadget>
<output>190</output>

<result>190</result>