The third and fourth grade students donated money to the disaster area. The third grade donated 769.3 yuan, 48.9 yuan less than the fourth grade. How much did the two grades donate in total?
三、四年级学生向灾区捐款，三年级捐了769.3元，比四年级少48.9元，两个年级共捐了多少钱？
<gadget id="calculator">769.3 + 48.9</gadget>
<output>818.2</output>

<gadget id="calculator">769.3 + 818.2</gadget>
<output>1_587.5</output>

<result>1_587.5</result>