Answer:
2:1:3
Explanation:
To simplify you find the greatest common factor and divide all the numbers by it, in this case 7 is the largest number that goes into all the numbers.
14 divided by 7 =2
7 divided by 7 = 1
21 divided by 7 = 3
2 : 1 : 3
14 : 7 : 21 ( divide each part of the ratio by 7 )
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