A rectangular vegetable garden has a perimeter of 8 meters and the ratio of length to width is 5:3. Find the area of this vegetable garden.
一个长方形菜园，周长为8米，长与宽的比是5：3，求这块菜园的面积．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 / 2 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 5</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(1/2) * 3</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(5/2) * (3/2)</gadget>
<output>15/4 = around 3.75</output>

<result>15/4 = around 3.75</result>