Q2. A three phase 4 wire Y connected unbalanced load consists of: Zan = 50 Ω, Zbn = 50<40° Ω,
Zcn = 50<-50° Ω. If the three phase source voltage has ACB sequence of line to line voltage is
208 V, calculate the neutral current. ANSWER: 3.64<1.7° A
Here is my attached solution

 

The page here, see example 4.6:
http://www.electrical-engineering-assignment.com/12-unbalanced-delta-connected-load
... seems to show how the problem should be solved.