The perimeter of a rectangular piece of glass is 96 cm, and the ratio of length to width is 7:5. Find the area of this piece of glass.
一块长方形玻璃的周长是96厘米，长和宽的比是7：5，求这块玻璃的面积．
<gadget id="calculator">96 / 2</gadget>
<output>48</output>

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

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

<gadget id="calculator">48 * (5/12)</gadget>
<output>20</output>

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

<gadget id="calculator">48 * (7/12)</gadget>
<output>28</output>

<gadget id="calculator">20 * 28</gadget>
<output>560</output>

<result>560</result>