The population of Gordonia is 1/2 * 80000 people = 40000 people
Toadon has 60/100 * 40000 people = <<60/100*40000=24000>>24000 people
The total population of Gordonia and Toadon is 40000 people + 24000 people = <<40000+24000=64000>>64000 people
The population of Lake Bright is 80000 people - 64000 people = <<80000-64000=16000>>16000 people
#### 16000