Angles of a triangle in a given ratio: find an angle or a difference

1. A.
   $100^\circ$
2. B.
   $45^\circ$
3. C.
   $90^\circ$
4. D.
   $105^\circ$

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1. A.
   $24^\circ$
2. B.
   $20^\circ$
3. C.
   $16^\circ$
4. D.
   $12^\circ$

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1. A.
   15
2. B.
   30
3. C.
   45
4. D.
   60

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1. A.
   $80^\circ$
2. B.
   $120^\circ$
3. C.
   $60^\circ$
4. D.
   $100^\circ$

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