Well .. A ration is soemthing we use in Maths.
It is the square root of ratio moment of inertia of the given axis to its mass.
12
Well, if you mean 3/5=?/20 , then of course it would be 12/20 because 5x4=20 , 3x4=12. If that's not what you meant.....sorry ?
If the ratio of similarity is 310, then the ratio of their area is 96100.
an eqivalent ratio is an ratio that is equal or you can simplfiy it