My answer was "Hol eszel?" And since there no clear indication that they mean the plural "you", am I right to suspect that my answer should be accepted?
I know we have not touched on past tense yet. but to my understanding you put a "t" + the pronoun ending on the end of the verb to denote past tense. Therefore, what would, "Where did you eat?" look like?
Hol ettél? (singular)
Hol ettetek? (plural)
I got burned with "Te hol esztek?"
Using singular te with plural -tek will do that to you.