piece of iron wire is 16 cm long, if it forms a rectangle with a ratio of length to width of 3:1, what is its area in square centimeters?
一根铁丝长16厘米，如果围成一个长与宽的比是3：1的长方形，它的面积是多少平方厘米？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 * (3/4)</gadget>
<output>6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">8 * (1/4)</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>