For a parallelogram, if the height increases by 3 cm and the base remains the same, the area increases by 27 cm2; if the height remains the same and the base decreases by 2 cm, the area decreases by 12 cm2. What is the area of the original parallelogram in square centimetres?
一个平行四边形，若高增加3厘米，底不变，面积则增加27平方厘米；若高不变，底减少2厘米，面积则减少12平方厘米．原平行四边形的面积是多少平方厘米
<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>