The ratio of the area of the flowerbed to the playing field in the garden of the experimental primary school is 2:9, the area of the flowerbed is 90 square meters, how many square meters is the area of the playing field?
实验小学花园的花圃与运动场面积的比为2：9，花圃的面积是90平方米，运动场的面积是多少平方米？
<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">90 * (9/2)</gadget>
<output>405</output>

<result>405</result>