Respuesta :
Answer:
3
Step-by-step explanation:
r = red bird seen = 8
b = blue birds
r = b+5
8 = b+5
b =3
He see's 3 blue birds
You have to subtract 8 from 5 because it says he sees five more red birds than blue once you subtract you would get an answer of 3, so Trevor would see 3 blue birds.