The area of a rectangle is 156 square centimeters after the length is tripled and the width is quadrupled. Find the area of the original rectangle.
一个长方形的长扩大3倍，宽扩大4倍后，面积是156平方厘米．求原来长方形的面积．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">156 / 12</gadget>
<output>13</output>

<result>13</result>