There are 24 hours in a day and scientists tell us that we should sleep for 3/8 of the day. How much

[math_celebrity]

There are 24 hours in a day and scientists tell us that we should sleep for 3/8 of the day. How much time should we spend sleeping?

Multiply 24 hours per day * 3/8 day
Since 24/8 = 3, we have:
3 * 3 = 9 hours of sleep.