The answer is 80%
If Gary has 5 hours of free time per day, he has 35 hours of free time per week.
1 week = 7 days
1 day = 5 h of free time
1 week = 7 * 5h of free time = 35h of free time
Gary spends 14 hours per week on the Internet and 14 hours per week playing video games. That is total 28 hours (14 + 14 = 28)
So, the percent of his free time is spent on the Internet and playing video games is:
28/35*100% = 80%