Answer: He can play 4 rounds of his favorite game
Explanation:
Zack has 3/4 hours to play video games. This means that he cannot spend more than 3/4 hours playing video games. it takes him 1/12hours to set up the system before he starts playing. This means that the time left for him to play games would be the time he has to play - the time it takes him to set up the video game. It becomes
3/4 - 1/12 = 8/12
If each round of his favorite game takes 1/6 hours, the number of rounds he can play would be the time he has left to play/time per round of his favorite game. It becomes
8/12 ÷ 1/6
= 8/12 × 6/1
= 4