How many people who were being tracked and who were between 30 and 40 years of age in 1980 survived until 2010?
Explanation:
Those who were in the age range 30-40 in 1980 will be in the age range 60-70 in 2010.
Number of people alive in age range 60-70 in 2010 = 90 + 100 = 190
Hence, option (a).
» Your doubt will be displayed only after approval.
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.