The perimeter of a rectangle is 48 cm, and the ratio of length to width is 13:11. What is its area?
一个长方形的周长是48厘米，长与宽的比13：11，它它的面积是多少．
<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">13 + 11</gadget>
<output>24</output>

<gadget id="calculator">13 / 24</gadget>
<output>13/24 = around 0.541667</output>

<gadget id="calculator">24 * (13/24)</gadget>
<output>13</output>

<gadget id="calculator">11 / 24</gadget>
<output>11/24 = around 0.458333</output>

<gadget id="calculator">24 * (13/24) * 24 * (11/24)</gadget>
<output>143</output>

<result>143</result>