Jonathan goes to bed at 9:30 PM on school nights and wakes up at 6:00 AM. On Fridays and Saturdays, he goes to bed at 11:00 PM and wakes up at 9.00 AM. What is Jonathan's average rate of sleep hours per night?

Question

1192 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-01-02T14:45:12

#8hrs and 55min#

On school nights, Jonathan sleeps from 9:30 pm to 6:00 am
Which means he sleeps for = #8.5 hrs# on these nights

So his sleep for 5 nights (Mon-Thu and Sun) = #5xx8.5# = #42.5hrs#

On Friday & Saturday, he sleeps from 11:00pm to 9:00 am i.e. he sleeps for #10 hrs# on each of these two days.

So, his total sleep for Friday and Saturday = #2xx10# = #20 hrs#

Now, his total sleep hours for entire week = #42.5+20# = #62.5 hrs#

And his average rate of sleep per night = #62.5/7# = #8.92 hrs#

or, approximately, #8 hrs and 55 min#