if you do 10:20 then it would be a ratio.
it is 452.16
it is 19
i found my answer and it is 35.66666667
plus i did it on a clacture
i found my answer and it is 35.66666667 
what is the square root of 5 then divide by 10 then plus 20 then times 100?
it is 452.16
it is 19