The bus station square is 100 meters long and 68 meters wide. A flower bed of 320 square meters is left in the middle, and the rest are covered with colored floor tiles. How many square meters are the colored floor tiles laid?
汽车站广场长100米，宽68米．中间留下320平方米的花坛，其余都铺彩色地砖．彩色地砖铺了多少平方米？
<gadget id="calculator">100 * 68</gadget>
<output>6_800</output>

<gadget id="calculator">6_800 - 320</gadget>
<output>6_480</output>

<result>6_480</result>