The bookstore bought 195 exercise books, and 75 were left after selling for 2 days. How many copies are sold per day on average?
书店进了195本练习册，卖了2天还剩75本．平均每天卖多少本？
<gadget id="calculator">195 - 75</gadget>
<output>120</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<result>60</result>