A rectangle, if the length is increased by 2 meters and the width is increased by 5 meters, then the area is increased by 60 square meters, and it becomes exactly a square. What is the area of the original rectangle?
一个长方形，如果长增加2米，宽增加5米，那么面积增加60平方米，这时恰好成为一个正方形．原来长方形的面积是多少平方米？
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>