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=$\frac{3}{28}a$

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

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

p=$\frac{4}{15}b$

we could substitute:

p=$\frac{4*3}{15*28}$

and solve:

p=$\frac{1}{35}$
and this is the answer!