There is a rectangular playground with a perimeter of 280 meters and a ratio of length to width of 4:3. What is the area of the playground?
有一个长方形操场，周长280米，长和宽的比是4：3，这个操场的面积是多少？
<gadget id="calculator">280 / 2</gadget>
<output>140</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">140 * (4/7)</gadget>
<output>80</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">140 * (3/7)</gadget>
<output>60</output>

<gadget id="calculator">80 * 60</gadget>
<output>4_800</output>

<result>4_800</result>