The school is going to distribute the "Student Monthly", which will be distributed to 21 classes, with an average of 124 copies per class, and the whole school needs 65 copies as spares. How many copies of "Student Monthly" should schools buy?
学校准备发《学生月刊》，要发给21个班，平均每班发124本，全校还需要65本作为备用．学校应买多少本《学生月刊》？
<gadget id="calculator">124 * 21</gadget>
<output>2_604</output>

<gadget id="calculator">2_604 + 65</gadget>
<output>2_669</output>

<result>2_669</result>