12 : 20 = 6 : 10 = 3 : 5
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12/25this is because you shouldn't have decimals on the numerator
To simplify the ratio 21 to 27, you need to find the greatest common divisor (GCD) of the two numbers, which is 3. Divide both numbers by 3 to simplify the ratio: 21 ÷ 3 = 7 and 27 ÷ 3 = 9. Therefore, the simplified ratio of 21 to 27 is 7 to 9.
0.6/2.4 = 0.1/4 = 1/40
Factor out the 6, 6*1 : 6*7 as 6 appears in both sides of this ratio as a factor it can be eliminated 1 : 7 ===
12/20 = 0.612/20 = 0.612/20 = 0.612/20 = 0.6