If the length of a rectangle remains the same, the width increases by 2 meters, and the area increases by 30 square meters. If the width remains the same, the length increases by 3 meters, and the area also increases by 30 square meters. What was the original area of the rectangle?
一个长方形，长不变，宽增加2米，面积要增加30平方米，如果宽不变，长增加3米，面积也增加30平方米．这个长方形原来的面积是多少？
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>