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It is 12:1
If you mean 3 12 then yes it is equivalent to 1 4
It is: 2 to 9
3:8
6 to 5
4 to 3
120 to 180 is an equivalent ratio.
12 to 10
It is: 3 to 4
3:4
1/2
It is: 12/20 = 3/5