20s
Next time you are caught daydreaming at work or school, blame it on your brain doing it's natural thing: wandering - and this wandering consumes what percentage of a human's life.
A
10-20%
B
20-30%
C
30-40%
D
40-50%
A
10-20%
B
20-30%
C
30-40%
D
40-50%