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Angles: Wooden Ruler

ACTMAT-RX4JK5

Johnny broke a flat wooden recatangular ruler into three exactly congruent (equal) parts and arranged them in the shape of a triangle, as shown below.

Find the measure of the angle labelled $x$.

A

$60°$

B

$120°$

C

$300°$

D

$45°$

E

$150°$