As shown in the picture, there is a rectangular vegetable field with a length of 25 meters and a width of 13 meters. There is a road with a width of 1 meter in the middle of the vegetable field, which divides the vegetable field into 4 evenly. What is the area of each small vegetable field?
如图，有一块长方形菜地，长25米，宽13米，菜地中间横竖各有一块宽1米的路，正好把菜地平均分成4块，每小块菜地的面积是多少？
<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">13 - 1</gadget>
<output>12</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">24 * 3</gadget>
<output>72</output>

<result>72</result>