To support the rebuilding of homes in the earthquake-stricken areas of Wenchuan, a fourth-grade student in a certain school donated 540 yuan, twice that of the third-grade students. How much did the two grades donate in total?
为支援汶川地震灾区重建家园，某校四年级学生捐款540元，是三年级的2倍，这两个年级共捐款多少元？
<gadget id="calculator">540 / 2</gadget>
<output>270</output>

<gadget id="calculator">540 + 270</gadget>
<output>810</output>

<result>810</result>