Question

in the town zoo, 3/28 of the animals are birds. of the birds, 4/15 are birds of prey. what fraction of the animals are birds of prey?

Answer 1

let's call the animals "a" and birds "b"

b=
`(3)/(28)a`

we knot this from3/28 of the animals are birds.

and we also know that 4/15 are birds of prey. so

p=
`(4)/(15)b`

we could substitute:

p=
`(4*3)/(15*28)`

and solve:

p=
`(1)/(35)`
and this is the answer!