22.5 or 22 and 1/2 is half of 45
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Half of 90 is 45 (90 divided by 2)
12 1/2
45/12 = 15/4 = 3 3/4
So 45 minutes is 3/4 of an hour (60 minutes in an hour, 45/60 simplifies to 3/4). That means the mixed number would be 2 3/4 hours.
Well, darling, 5 over 2 as a mixed number is 2 and a half. As a whole number, it's just 2 because you can't have half a person, or in this case, half a number. Keep it simple, honey.