The perimeter of a rectangle is 24 meters, and the ratio of its length to width is 7:5, what is the area of the rectangle in square meters?
一个长方形的周长为24米，它的长和宽的比是7：5，这个长方形的面积的多少平方米．
<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">12 * (7/12)</gadget>
<output>7</output>

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

<gadget id="calculator">12 * (7/12) * 5</gadget>
<output>35</output>

<result>35</result>