There are 700 exercise books in the stationery store. After some of them are sold, there are 4 packs left, with 25 books in each pack. How many copies are sold?
文具店有700本练习本，卖出一些后，还剩4包，每包25本，卖出多少本？
<gadget id="calculator">4 * 25</gadget>
<output>100</output>

<gadget id="calculator">700 - 100</gadget>
<output>600</output>

<result>600</result>