The population of a city in 1910 was 50,000, and it doubles every 10 years. What will it be (a) in 1970 (b) in 1990 (c) in 2,000?
Im trying to brush up my algebra skills and found this question.
I couldnt think of a purely algebraic way to find the answer, this is what I did.
There are 60 years between 1970 and 1910. Since the population doubles every 10 years, it will double 6 times in period of 60 years.
So if P = 50,000, 2P = 100000, 4P = 200000 8P = 400000, 16P = 800000, 32P = 16,00000 64P = 32,00000.
Is it done incorrectly/is there a algebraic method?