. There is a rectangular wooden board with a perimeter of 24 meters. The ratio of its length to width is 3:5. What is the area of this rectangle in square meters?
.有一块长方形木板，周长是24米，它的长和宽的比是3：5，这个长方形的面积是多少平方米．
<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">12 * (3/8)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">12 - (9/2)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(9/2) * (15/2)</gadget>
<output>135/4 = around 33.75</output>

<result>135/4 = around 33.75</result>