Yucai Primary School donates books to children in impoverished areas. 3. Class 1 donated 308 books, Class 3 and Class 2 donated 375 books, how many books were donated by the two classes?
育才小学为贫困地区的小朋友捐书．三、1班捐书308本，三、2班捐书375本，两班共捐书多少本．
<gadget id="calculator">308 + 375</gadget>
<output>683</output>

<result>683</result>