The area of a rectangular piece of land is 30 square centimeters. Its width is 3 centimeters. If the length remains the same and the width is increased to 30 centimeters, what is the area of this rectangular piece of land?
一块长方形土地的面积是30平方厘米．它的宽是3厘米，如果长不变，宽扩大到30厘米，这块长方形土地的面积是多少？
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<gadget id="calculator">10 * 30</gadget>
<output>300</output>

<result>300</result>