The perimeter of a rectangle is 24 cm, and the ratio of length to width is 7:5. What is the area of the rectangle in square centimeters?
一个长方形的周长是24厘米，长和宽的比是7：5，这个长方形的面积是多少平方厘米．
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">24 / 2 / 12</gadget>
<output>1</output>

<gadget id="calculator">7 * 1 * 5 * 1</gadget>
<output>35</output>

<result>35</result>