In his free time, Gary spends 12 hours per week on the Internet and 8 hours per week playing video games. If Gary has 35 hours of free time per week, approximately what percent of his free time is spent on the Internet and playing video games? A) 19%
B) 57%
C) 40%
D) 4%

B) 57%

Add up Garys hours spent on internet and games to get total time

12+8=20

To get the percent of time used on internet and games, divide by total time

20/35 = 0.57

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

the answer is 8/21

hope this