A rectangular green space in a residential area is 20 meters long and 10 meters wide. There are 3 square flower beds in the middle. The side length of the flower beds is 4 meters. There is a lawn around it. What is the area of the lawn in square meters?
某生活小区的一块长方形绿地长20米，宽10米，中间有3个正方形花坛，花坛边长是4米，周围是草坪，草坪的面积是多少平方米？
<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">4 * 4 * 3</gadget>
<output>48</output>

<gadget id="calculator">200 - 48</gadget>
<output>152</output>

<result>152</result>