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?
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.
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Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
You are solving math problems. Here are some examples of how to solve the task:

Max fills up water balloons for 30 minutes at a rate of 2 water balloons every minute. Max’s friend Zach fills up water balloons for 40 minutes at a rate of 3 water balloons every minute. In the process, 10 of the water balloons pop on the ground. How many filled water balloons do Max and Zach have in total?Max fills 30 * 2 = <<30*2=60>>60 water balloons
Zach fills 40 * 3 = <<40*3=120>>120 water balloons
Max and Zach have a total of 60 + 120 - 10 = <<60+120-10=170>>170 water balloons
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Mr. Rainwater has some goats, 9 cows and some chickens. He has 4 times as many goats as cows and 2 times as many goats as chickens. How many chickens does he have?Let X be the number of chickens Mr. Rainwater has. He has 4 goats/cow * 9 cows = <<4*9=36>>36 goats on his farm.
So he has 36 goats / 2 goats/chicken = <<36/2=18>>18 chickens.
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Now, solve this next question in the style of the above examples:

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?

### Response:
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.
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