When donating money for the disaster area, the first class of the fourth grade donated 245 yuan, the second class donated 280 yuan, and the third class donated 255 yuan. How much did each of the three classes donate on average?
在为灾区捐款时，四年级一班捐了245元，二班捐了280元，三班捐了255元，三个班平均每个班捐了多少元．
<gadget id="calculator">245 + 280 + 255</gadget>
<output>780</output>

<gadget id="calculator">780 / 3</gadget>
<output>260</output>

<result>260</result>