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Earlier discussion
2 older comments kept for context.
Dr. Joseph Udoh
For 20s = 1000/2 =500atoms
For another 20s = 500/2= 250s
For another 20s = 250/2 = 125s
Therefore, Total time(s) = 20+20+20 = 60s... Answer
Jb-Light
1000 → 500 → 250 → 125
20 + 20 + 20 = 60s