With a starting population of P, and triple in size means 3 times the original, we want to know t for:

P(1.06)^t = 3P

Divide each side by P, and we have:

1.06^t = 3

Typing this equation into our search engine to solve for t, we get:

t =

**18.85 years**

Note: if you need an integer answer, we round up to 19 years