The zoo has 8 x 3 = <<8*3=24>>24 snakes.
It has 24 x 2 = <<24*2=48>>48 monkeys.
The number of parrots and snakes added up is 8 + 24 = <<8+24=32>>32
There are 32/2 = <<32/2=16>>16 elephants.
There are 16 - 3 = <<16-3=13>>13 zebras.
The difference between zebras and monkeys is 48 - 13 = <<48-13=35>>35
#### 35