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They give you line-line voltage on both sides of the transformer. A single-phase transformer usually has its high-side terminals connected to 2 phases and its low-side terminals connected to one phase and a neutral. So you have to use line-line voltage for the high-side and line-neutral...

I think I know why, in question #118 I guess you assume it is a 3-phase transformer and in question #506 it is a bank of 3-single-phase transformers and you are looking for the turns ratio of each individual single-phase transformer.

I am wondering the exact same thing! Can someone please clarify this for us?