A rectangular piece of land has a perimeter of 140 meters and a ratio of length to width of 5:2. What is the area of this piece of land?
一块长方形的地，周长是140米，长与宽的比是5：2，这块地的面积是多少？
<gadget id="calculator">140 / 2</gadget>
<output>70</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">70 * (5/7)</gadget>
<output>50</output>

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

<gadget id="calculator">70 * (2/7)</gadget>
<output>20</output>

<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<result>1_000</result>