If the length of a parallelogram increases by 2cm, the area increases by 20cm**2, and the height increases by 3cm, the area increases by 45cm**2. What is the area of the original parallelogram in square centimeters?
一个平行四边形，长增加2cm后，面积增加20cm**2，高增加3cm后，面积增加45cm**2，原平行四边形的面积是多少平方厘米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">45 / 3</gadget>
<output>15</output>

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

<result>150</result>