Computing train value of planetary gear

[lucfuture]

Homework Equations

e=(product of number of driving teeth)/(product of number of driven teeth)

e=(n$_{out}$-n$_{arm}$)/(n$_{in}$-n$_{arm}$)

The Attempt at a Solution

e=(N$_{p1}$/N$_{s1}$)*(N$_{s2}$/N$_{p2}$)
e=1.25926

e should be 0.7941 however

From there out it seems pretty trivial. I just need to get the right e value.

 

[lucfuture]

Problem statement