It is 18/10 = 9/5.
18 to 25
You haven't specified which side of the ratio was to be greatest. The greatest difference is 6 to 11. This narrowly is greater than 10 to 18 (6/(11+6) compared to 10/(18+10)
The fraction is 18/20 which can be simplified to 9/10.
18:1
It is 18/10 = 9/5.
18 to 25
-18 is the ratio of -18 and 1 ... nice and rational. Also the ratio of 18 and -1, of 36 and -2, of 180 and -10, etc.
You haven't specified which side of the ratio was to be greatest. The greatest difference is 6 to 11. This narrowly is greater than 10 to 18 (6/(11+6) compared to 10/(18+10)
The fraction is 18/20 which can be simplified to 9/10.
18:1
7.2 to 10 = 72 to 100 = 18 to 25
10" to 1 yard = 10" to 36" = 10 to 36 = 5 to 18
10 : 180 minutes then the ratio would be 1 to 18, not 18 to 1. It is false.
The ratio then will be 18 to 10
10:18 or 5:9 (simplified)
Expressed as a ratio in its simplest form, by dividing the antecedent and consequent by 2, 20:18 is equal to 10:9 or ten to nine.