Question

a country's population in 1992 was 72 million in 1998 it was 76 million estimate the population in 2012

Answer 1

If it gained 4 million people every 6 years, then the gain PER year would be 1.5 million. from 1992 to 2012 is 10 years. So, 1.5 times 10 is 15. 72 + 15 =87.

Your answer is 87 million.