[supercat]

Only the birthrate matters, because you're given the 24K fixed population. Supercat's answer is right in #20.

There are three variables supplied: average birth rate per individual, average lifespan, and rate of population growth (which is specified as none). The supplied values for these variables are contradictory.

[Right Wing Professor]

There are three variables supplied: average birth rate per individual, average lifespan, and rate of population growth (which is specified as none). The supplied values for these variables are contradictory.

I agree.

[spunkets]

"There are three variables supplied: average birth rate per individual, average lifespan, and rate of population growth (which is specified as none). The supplied values for these variables are contradictory."

The birthrate is given as births/animal/decade. The deathrate is deaths/animal/decade.

birthrate = deathrate

What's contradictory?