When Xiaohong calculated the area of a rectangular lawn, she mistakenly regarded the width of 15 meters as 25 meters, and the resulting area was 800 square meters more than the correct one. What is the correct lawn size?
小红在计算一块长方形草坪的面积时，错把其中的宽15米看成25米，结果得到的面积比正确的多了800平方米．正确的草坪面积是多少？
<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<gadget id="calculator">800 / 10</gadget>
<output>80</output>

<gadget id="calculator">80 * 15</gadget>
<output>1_200</output>

<result>1_200</result>