A playground whose length is 5 times its width is surrounded by a runway of constant width. The outer circumference of the runway is 24 meters longer than the inner circumference. The area is 468 square meters. Find the area of the playground.
一个长是宽5倍的操场，被一条宽不变的跑道围住，跑道外面周长比里面的周长多24米，面积为468平方米，求操场面积．
<gadget id="calculator">24 / 8</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">468 - 9</gadget>
<output>459</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">3 - 5</gadget>
<output>-2</output>

<gadget id="calculator">5 + 15 + (-2)</gadget>
<output>18</output>

<gadget id="calculator">459 / 18</gadget>
<output>51/2 = around 25.5</output>

<gadget id="calculator">(51/2) * (51/2) * 5</gadget>
<output>13_005/4 = around 3_251.25</output>

<result>13_005/4 = around 3_251.25</result>