Yella can use the computer 8 x 7 = <<8*7=56>>56 hours for this week.

Therefore, Yella's computer usage for this week is 91 - 56 = <<91-56=35>>35 hours lesser than her computer usage last week.

# Answer

35
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
35
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?
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