For a rectangular nursery, if the length is increased by 5 meters, the area will be increased by 75 square meters; if the width is increased by 5 meters, the area will be increased by 125 square meters. What is the original area of the nursery?
一个长方形苗圃，如果长增加5米面积就增加75平方米；如果宽增加5米，面积就增加125平方米，原来苗圃的面积是多少平方米？
<gadget id="calculator">125 / 5</gadget>
<output>25</output>

<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">25 * 15</gadget>
<output>375</output>

<result>375</result>