Mac sleep 91 hour per week he sleep the same amount of time everyday.
how many hours does he sleep every day

Since there are 7 days in a week and he slept the same amount of time each day, we can determine the number of hours he slept each day by dividing the number of hours he slept the whole week, 91 hours, and the number of days he slept. So you would get 91/7, which is 13. So Mac slept 13 hours each day. Hope this helps. 

13 hours because there are 7 days in a week and you have to divide 91 hours to 7 days and you get 13 hours

i hope i helped