Question

The population of a country in 2015 was estimated to be 321.9 million people. This was an increase of 29% from the population in 1990. What was the population of the country in 1990?

Answer 1

The population of the country in 1990 is 249.5 million

Explanation:

• Let 'x' be the population in 1990.
• The population in 2015 is 321.9 million.

The increase in x by 29% = 321.9
`*`10^6

(since x is 100% and increase of 29% will be 129%)

129% of x = 321.9
`*`10^6

1.29x = 321.9
`*`10^6

x = 321.9
`*`10^6/1.29

x = 249.5
`*`10^6

x = 249.5 million.

∴ The population of the country in 1990 is 249.5 million