Use stainless steel strips to surround a rectangular flower bed with railings, sharing 70 meters of railings. It is known that the ratio of the length to the width of the flower bed is 5:2, what is the area of the flower bed in square meters?
用不锈钢条给一个长方形花坛围上栏杆，共用栏杆70米．已知花坛长和宽的比是5：2，这个花坛的面积是多少平方米？
<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>