There is a vegetable field with a length of 20 meters and a width of 12 meters. There are two small roads with a width of 2 meters in the middle of the vegetable field. What is the area of each rectangle.
有一块菜地长20米，宽12米，菜地中间留着两条宽2米的小路，两条小路摆成十字型，菜地平均分4块．每块长方形地的面积是多少．
<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">18 * (5/2)</gadget>
<output>45</output>

<result>45</result>