Turns ratio of multi winding transformer
You can only have a turns ratio between a pair of coils. You can't have an overall term ratio when several coils are involved unless you connect pairs of coils to form one coil.

For example, 8 - 9 and 9 -10 are series connected and the combined turns ratio would be 9.25:1 + 9.25:1= 9.25:2 between 8 and 10.

This should be clear as doubling the number of turns will double the output voltage.