SOLUTION: An exterior angle of a triangle measures 120 degree and its interior opposite angle are in ratio 7:5. Find the angle of the triangle

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Question 1105301: An exterior angle of a triangle measures 120 degree and its interior opposite angle are in ratio 7:5. Find the angle of the triangle
Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
The exterior angle 120 degrees means the supplementing interior angle is 60 degrees.

Let the other two interior angles be some 5x and 7x degrees.

60%2B5x%2B7x=180
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12x=180-60
12x=120
x=10

This says that the other two angles are 50 degrees and 70 degrees.