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B
X=30∘,Y=55∘
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C
X=60∘,Y=75∘
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D
X=45∘,Y=30∘
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Solution
The correct option is CX=60∘,Y=75∘ From exterior angle property of triangles, we have 45∘+y=120∘⇒y=120∘−45∘=75∘⇒y=75∘ From angle sum property of triangles, we have 45∘+75∘+x∘=180∘⇒x=180∘−120∘⇒x=60∘ Hence, the value is x=60∘,y=75∘