Question

How many years it took to increase the population of the world from $1$ billion to $2$ billion?

• A. $50$
• B. $100$
• C. $150$
• D. $200$

Answer 1

The correct option is B $100$

Population of the world increased from $1$ billion in $1830$ to $2$ billion in $1930$. It took a long time of $100$ years for world population to increase from $1$ billion to $2$ billion due to high rate of mortality. In contrast it took only $12$ years for the world population to increase from $6$ billion in $1999$ to $7$ billion in $2011$.