Yo, im doing the same CR right now. haha
I think i have an idea on what to do.
triangles have to equal 180 degrees.
if A = 45
and C = 60
then B = 75
45 + 60 + 75 = 180.
it says the ABC is SIMILAR to XYZ.
I think they are both congruent, so ABC and XYZ have the same measurements.
that means is B = 75
then Y = 75.
i could be wrong, but thats what i think the answer would be.