There is a rectangle whose length to width ratio is 7:5. It is known that the perimeter of the rectangle is 48 cm. What is the area of the rectangle in square centimeters?
有一个长方形，长与宽的比是7：5，已知长方形的周长是48cm，这个长方形的面积是多少平方厘米？
<gadget id="calculator">48 / 2</gadget>
<output>24</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">24 * (7/12)</gadget>
<output>14</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">24 * (5/12)</gadget>
<output>10</output>

<gadget id="calculator">14 * 10</gadget>
<output>140</output>

<result>140</result>