The perimeter of a rectangle is 70 cm, and the ratio of length to width is 5:2. What is the area of the rectangle?
一个长方形的周长是70厘米，长和宽的比是5：2，这个长方形的面积是多少平方厘米？
<gadget id="calculator">70 / 2</gadget>
<output>35</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">35 * (5/7)</gadget>
<output>25</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">35 * (2/7)</gadget>
<output>10</output>

<gadget id="calculator">25 * 10</gadget>
<output>250</output>

<result>250</result>