The perimeter of a rectangle is 2.4 decimeters, 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2.4分米，长和宽的比是7：5，这个长方形的面积是多少．
<gadget id="calculator">10 / 2</gadget>
<output>5</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">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">2.4 * 5 * (7/12) * 2.4 * 5 * (5/12)</gadget>
<output>35</output>

<result>35</result>