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.