There is a rectangle, if its length remains the same, the width decreases by 2 meters, the area decreases by 24 square meters; if its width remains the same, the length increases by 3 meters, the area increases by 15 square meters. Find the area of the original rectangle.
有一个长方形，如果它的长不变，宽减少2米，面积就减少24平方米；如果它的宽不变，长增加3米，面积就增加15平方米．求原长方形的面积．
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<result>60</result>