Safari National park has 1/2*100=<<1/2*100=50>>50 snakes.
Safari National park has 50-10=<<50-10=40>>40 giraffes.
Savanna National park has 100*2=<<100*2=200>>200 lions.
Savanna National park has 50*3=<<50*3=150>>150 snakes.
Savanna National park has 40+20=<<40+20=60>>60 giraffes.
Savanna National park has a total of 200+150+60=<<200+150+60=410>>410 animals.
#### 410