The smallest sea in the world is the Sea of Marmara, with an area of 11,000 square kilometers. The area of the Sea of Marmara is 1,220 square kilometers more than four times the area of Taihu Lake in my country. What is the area of Taihu Lake in square kilometers?
世界上面积最小的海是马尔马拉海，面积是11000平方千米，马尔马拉海的面积比我国太湖面积的4倍还多1220平方千米．太湖的面积是多少平方千米？
<gadget id="calculator">11_000 - 1_220</gadget>
<output>9_780</output>

<gadget id="calculator">9_780 / 4</gadget>
<output>2_445</output>

<result>2_445</result>