How Many Years Did It Take for the World Population

Question

How many years did it take for the world population to go from one billion to six billion?
A) 100,000
B) 1 million
C) 200
D) 10,000
E) 1 billion

Accepted Answer

The world population reached one billion around 1804 and six billion in 1999, taking approximately 195 years, which is closest to 200 years.