The perimeter of a rectangle is 48 cm, and the ratio of length to width is 7:5. What is the area of the rectangle?
一个长方形的周长是48厘米，长和宽的比是7：5，这个长方形的面积是多少？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">48 / 2 / 12</gadget>
<output>2</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

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

<result>140</result>