How many of the males who were being tracked and who were between 20 and 30 yearsof age in 1980 died in the period 2000 to 2010?
Explanation:
1980 age range 20-30 (500 males) is same as 2000 age range 40-50 (205 males) is same as 2010 age range 50-60 (165 males)
∴ Number of required males dying between 2000 and 2010 = 205 – 165 = 40.
Hence, 40.
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