A rectangle, when its width increases by 3cm, its area increases by 24cm**2; when its length increases by 4cm, its area increases by 16cm**2; what is the original area of this rectangle.
一个长方形，当它的宽增加3cm时，面积增加24cm**2；当它的长增加4cm时，这个它的面积增加16cm**2；，这个长方形原来的面积是多少．
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">8 * 4</gadget>
<output>32</output>

<result>32</result>