Well, honey, the ratio of 3 to 21 is 1:7. You could also simplify it by dividing both numbers by 3 to get 1:7. Hope that clears things up for you!
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The difference of the ratio is three. 21 is three times larger than 7
21/1600 = 0.013125
The ratio of 3 to 5 is 3/5.
16:21
Convert the ratio to fraction first, then convert the fraction to decimal. Example: ratio = 3 : 4 3 : 4 = 3/4 = 0.75