Answer:
1/2
Step-by-step explanation:
What we must do is calculate the fraction of the hours of sleep with respect to the hours of a day.
We know that a day has 24 hours.
Now:
12 hours of sleep for the every 24 hours in a day, it would be:
12/24
Simplify to get 1/2
We know that 1/2 is equal to 0.5 or what is the same as he spends 50% of the time asleep.