The 2 triangles are congruent, so all corresponding angles and sides are equal.
so,
∠P = ∠U
then,
y + 10 = 2y - 40
solve for y,
y + 10 = 2y - 40
add both sides by 40
y + 10 +40 = 2y - 40 +40
y + 50 = 2y
2y - y = 50
y = 50
solve for ∠U,
∠U = 2y - 40
∠U = 2(50) - 40
∠U = 100 - 40
∠U = 60°
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