There is a square vegetable field, one side is against a wall, and the other three sides are fenced. The fence is 75 meters long. What is the area of this vegetable field in square meters?
有一块正方形菜地，一面靠墙，其他三面有篱笆，篱笆长75米，这块菜地的面积是多少平方米？
<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<result>625</result>