Help calculating Neutral current

[Sparky Bill PE]

When I solve this problem, I am using Load C and A to get my angle of current. I am giving the PF of the load, so I am taking the conjugant. In this solution It is using 240-angel and 120-angle and I don't know why they are doing that when finding current. 

 

[Cuseman17]

Apart from the angles, shouldn't Ib in the addition for In be negative? If we do KCL, Ia and Ic will be leaving the neutral point N and Ib will be entering it. Or am I missing something?

 

[akyip]

Yeah, I remember this was a weird solution off of the Spin up Exams. This solution really doesn't make sense to me either, it seems incorrect.