A rectangular playground has a perimeter of 76 meters and a ratio of length to width of 10:9. What is the area of the playground in square meters?
一个长方形操场，周长76米，长与宽的比是10：9．这块操场的面积是多少平方米？
<gadget id="calculator">76 / 2</gadget>
<output>38</output>

<gadget id="calculator">10 + 9</gadget>
<output>19</output>

<gadget id="calculator">10 / 19</gadget>
<output>10/19 = around 0.526316</output>

<gadget id="calculator">38 * (10/19)</gadget>
<output>20</output>

<gadget id="calculator">9 / 19</gadget>
<output>9/19 = around 0.473684</output>

<gadget id="calculator">38 * (9/19)</gadget>
<output>18</output>

<gadget id="calculator">20 * 18</gadget>
<output>360</output>

<result>360</result>