The perimeter of a rectangular playground is 560 meters, and the ratio of length to width is 4:3. What is the area of the playground?
一块长方形操场的周长是560米，长与宽的比是4：3，这块操场面积是多少？
<gadget id="calculator">560 / 2</gadget>
<output>280</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">280 * (4/7)</gadget>
<output>160</output>

<gadget id="calculator">280 - 160</gadget>
<output>120</output>

<gadget id="calculator">160 * 120</gadget>
<output>19_200</output>

<result>19_200</result>