The park plans to plant a rectangular field with grass. If the length of the land increases by 4.5 meters, or its width increases by 2.5 meters, the area of the land will increase by 22.5 square meters. What is the area of this land?
公园计划把一块长方形的地种上草．如果这块地的长增加4.5米，或它的宽增加2.5米，这块地的面积都将增加22.5平方米．这块地的面积是多少．
<gadget id="calculator">22.5 / 4.5</gadget>
<output>5</output>

<gadget id="calculator">22.5 / 2.5</gadget>
<output>9</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>