The school store shipped 4,500 exercise books, and after 14 days of selling, there were still 594 copies left. How many copies are sold per day on average?
学校商店运来4500本练习本，卖了14天后，还剩下594本．平均每天卖多少本？
<gadget id="calculator">4_500 - 594</gadget>
<output>3_906</output>

<gadget id="calculator">3_906 / 14</gadget>
<output>279</output>

<result>279</result>