Gear Ratio chart help

[Welshy40]

Guys,

I am in need of some help.

I have the below gear ratio chart that is in need of expanding from a 90 to 85 spur gears and 15 to 26 pinions.

But I am after a full chart with all pinions and spurs, but maths is not one of my strong points so hence why the help. I have no internal ratio at all so kindof stuck with the below. Anyone out there capable of working this out or figuring out the internal ratio. Thanks.

15 16 17 18 19 20 21 22 23 24
90 13.29 12.46 11.72 11.07 10.49 9.96
89
88
87 12.04 11.33 10.70 10.14 9.63 9.17
86 11.20 10.58 10.02 9.52 9.07
85