Question 1203606
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<pre>

    220 = 40 + 0.05x

    x = {{{(220-40)/0.05}}} = {{{180/0.05}}} = 3600.


<U>ANSWER</U>.  3600 years, under the given conditions.
</pre>

Solved.


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The formula, of course, is not realistic: it says that the population increases by 1 animal in 20 years.


Therefore, the answer does not look realistic, too.



This problem is only good to scare people around.