The small panda bears eat a total of 4 x 25 = <<4*25=100>>100 pounds of bamboo every day.
The bigger panda bears eat a total of 5 x 40 = <<5*40=200>>200 pounds of bamboo every day.
So, the 9 pandas eat a total of 100 + 200 = <<100+200=300>>300 pounds of bamboo every day.
Therefore, they eat a total of 300 x 7 = <<300*7=2100>>2100 pounds in a week.
#### 2100