Explanation:
both triangles are congruent so all the angles in all 3 pairs of corresponding angles are equal to each other.
that means the angle Y = 124°.
remember, the sum of all angles in a triangle is always 180°.
so,
180 = angle X + angle Y + angle Z = 33 + 124 + angle Z
angle Z = 180 - 33 - 124 = 23°