Answer:
Step-by-step explanation:
Monkeys: 150-20=130
Bears:23-18= 5
Snakes: 123-20=103
now you add every answer
130+5+103=
238 animals
x + 8a = 25 + ax - 7a
x = 5
5 + 8a = 25 + 5a - 7a
5 + 8a = 25 - 2a
5 + 10a = 25
10a = 20
a = 2