a day has 24hours
so 21hours make out 21/24 which can be furthur solved to 7/8 in terms of fraction.
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If you mean as in 24 hours then it is equivalent to 21/125 of a day
12 hours*21 days=252 hours
To determine what fraction of the day is 9 hours, we first need to establish how many hours are in a day. Since a day consists of 24 hours, we can express 9 hours as a fraction of the day by dividing 9 by 24. This simplifies to 3/8. Therefore, 9 hours is 3/8 or three-eighths of a day.
3 hours is 1/8 of a full day. 3 hours divided by 24 (hours in a day) = 3/24 = 1/8 (This could vary with the number of hours in the "day" you are considering: a full day, day as opposed to night, or a work day.)
8 hours is one-third of a day. If the time period is 8 hours, the fraction of a day is 8 divided by 24 (hours in a day). 8/24 = 1/3