Xinhua Bookstore shipped 1,275 copies of "Xinhua Dictionary". After 25 days of selling, there are still 150 copies left. How many copies are sold per day on average?
新华书店运来1275本《新华字典》，卖25天后，还剩下150夲，平均每天卖出多少本？
<gadget id="calculator">1_275 - 150</gadget>
<output>1_125</output>

<gadget id="calculator">1_125 / 25</gadget>
<output>45</output>

<result>45</result>