If the perimeter of a rectangle is 30 cm and the length is 1.5 times the width, what is the area of the rectangle in square centimeters?
一个长方形的周长是30厘米，长是宽的1.5倍，这个长方形的面积是多少平方厘米．
<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 * 1.5 * 6</gadget>
<output>54</output>

<result>54</result>