Answer:
4 hours
Explanation:
We know that there are 24 hours in a day. Therefore, we will subtract from 24.
If mark spends one-third of his day sleeping, then he will be asleep for 8 hours.

We also know that if Mark spends one-sixth of his day at soccer practice, he will have been practicing for 4 hours.

We now simply subtract from 24:

Therefore, Mark will have 4 hours of free time.