Question with 3 Phase Transformers Wye-Delta problem

[Aristotle]

Homework Statement

Homework Equations

Wye:
V_Line = sqrt(3) x V_Phase

Delta:
V_Line = V_Phase

The Attempt at a Solution

My answer doesn't quite match up with the solutions in the book, and was wondering what I went wrong here? Any help is greatly appreciated!

 

[Tom.G]

For part a) I get approx. the book answer if the secondary load is 3 phase 4 wire, same configuration as the primary.
You might find it more straightforward to work directly with resistances, rather than with current then calculating resistances.

As the textbooks like to say: "Part b) is left as an exercise for the reader."

 

[Aristotle]

For part a) I get approx. the book answer if the secondary load is 3 phase 4 wire, same configuration as the primary.
You might find it more straightforward to work directly with resistances, rather than with current then calculating resistances.

As the textbooks like to say: "Part b) is left as an exercise for the reader."

Yes I've solved it, turned out part b's solution of the book is incorrect according to my professor. Thanks!