The current population of a certain type of organism is about 100 million.

Question

The population is currently increasing at an annual rate that will make the population double in 18 years. If this pattern continues, what will the population of this country be, in millions of organisms, 54 years from now?

Answer 1

In 54 years, the population will have doubled three times (54/18 = 3). 100 million * 2 * 2 * 2 = 800 million.

Another way to solve this problem:

If the population doubles every 18 years, then 18 years from now, the population will be 200 million.

18 years from that point (36 years from now), the population doubles and is 400 million.

Then, 18 years from that point (54 years from now), the population doubles again and is 800 million.

Answer 2

54/18 = 3 occurances of doubling.

100(2)³ = 800 million

Answer 3

54 / 18 = 3

The population doubles 3 times or is 8 time the staring amount,

800,000,000