Answer one of these three to continue. Find the missing angle:

 Door 1

 Door 2

 Door 3

 Triangle ABC:
L
A= 90,
LB= 30, LC =?

 Triangle XYZ:
L
X= 35,
LY= 30, LZ =?

 Triangle ABC:
L
A= 45,
LB= 45, LC =?

 

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