let's call animals "a", and birds "b", birds of prey, "p"
so, b=\(\frac{3}{28} a\)
and p=\(\frac{4}{15} b\)
what;s the relation of p to a?
we substitude b into the last one:
and p=\(\frac{4}{15}* \frac{3}{28} a\)
so:
p=\(\frac{4*3}{15*28} a\)
p=\(\frac{4*1}{5*28} a\)
p=\(\frac{1*1}{5*7} a\)
p=\(\frac{1*1}{35} a\)
which is the answer!