In the donation activity for the disaster area, the Sixth Class donated 245 yuan, and the Sixth Class donated 45 yuan less than twice that of the First Class. How much did the two classes donate in total?
在为灾区捐款活动中，六一班捐款245元，六二班捐的比一班的2倍少45元．两个班共捐款多少元？
<gadget id="calculator">245 * 2</gadget>
<output>490</output>

<gadget id="calculator">490 - 45</gadget>
<output>445</output>

<gadget id="calculator">245 + 445</gadget>
<output>690</output>

<result>690</result>