If the perimeter of a rectangle is 240 cm and the ratio of length to width is 3:1, what is the area of the rectangle in square centimeters?
一个长方形的周长是240厘米，长和宽比是3：1，这个长方形的面积是多少平方厘米．
<gadget id="calculator">240 / 2</gadget>
<output>120</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">120 * (3/4)</gadget>
<output>90</output>

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

<gadget id="calculator">120 * (1/4)</gadget>
<output>30</output>

<gadget id="calculator">90 * 30</gadget>
<output>2_700</output>

<result>2_700</result>