A rectangle with a perimeter of 120 cm has a ratio of length to width of 7:5. What is the area of this rectangle in square centimeters?
周长120厘米的长方形，长、宽的比是7：5．这个长方形的面积是多少平方厘米？
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">60 * (7/12)</gadget>
<output>35</output>

<gadget id="calculator">60 - 35</gadget>
<output>25</output>

<gadget id="calculator">35 * 25</gadget>
<output>875</output>

<result>875</result>