If the length of a rectangle increases by 2 cm and the width increases by 5 cm, then the area increases by 60 square centimeters, and it happens to be a square at this time. What is the area of the original rectangle?
一个长方形，如果长增加2厘米，宽增加5厘米，那么面积就增加60平方厘米，并且这时恰好变成一个正方形，原来长方形的面积是多少？
<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>