The fifth grade students donated 700 books to Hope Primary School, 45 books were packed into a pack, and 15 packs were packed, how many books are left?
五年级同学向希望小学捐了700本书，45本包成一包，包了15包，还剩多少本？
<gadget id="calculator">45 * 15</gadget>
<output>675</output>

<gadget id="calculator">700 - 675</gadget>
<output>25</output>

<result>25</result>