My question is: Yella's computer usage last week was 91 hours. If she plans to use the computer 8 hours a day for this week, how much less ​is her computer usage for this week? Your thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Yella can use the computer 8 x 7 = 56 hours for this week. Therefore, Yella's computer usage for this week is 91 - 56 = 35 hours lesser than her computer usage last week. The final answer: 35.