The perimeter of a rectangle is 30cm. If the length and width in centimeters are composite numbers, what is its area in cm**2.
一个长方形的周长是30cm，如果长和宽的厘米数都是合数，那么它的面积是多少cm**2．
<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>