It is 0.0875
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24
In it's simplest form: 24:42 12:21 4:7
90
To find the ratio of 21 hours to 2 days, you first need to convert both time periods to the same unit. Since there are 24 hours in a day, 2 days is equal to 2 x 24 = 48 hours. Therefore, the ratio of 21 hours to 2 days is 21:48, which can be simplified to 7:16 by dividing both numbers by their greatest common factor, which is 3 in this case.
21/7 = 3 Or, a 3 to 1 ratio.