The area of Poyang Lake is 3960 square kilometers, and the area of Dongting Lake is 1500 square kilometers larger than that of Poyang Lake (1/3). How many square kilometers is the area of Dongting Lake?
鄱阳湖的面积是3960平方千米，洞庭湖的面积比鄱阳湖面积的(1/3)大1500平方千米，洞庭湖的面积是多少平方千米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3_960 * (1/3)</gadget>
<output>1_320</output>

<gadget id="calculator">1_320 + 1_500</gadget>
<output>2_820</output>

<result>2_820</result>