SOLUTION: The measure of the second interior angle of a triangle is three times greater than that of the first. The measure of the third interior angle of the triangle is eight times greater

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Question 886781: The measure of the second interior angle of a triangle is three times greater than that of the first. The measure of the third interior angle of the triangle is eight times greater than that of the first. What is the measure of the third angle? 60, 25, 120, or 15
Answer by verclau(6) About Me  (Show Source):
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So you have a triangle ABC with the first inside angle A which has x degrees.The second interior angle B has three times more than A that means 3x degrees.The third one C has eight times more than the first one A that means 8x degrees.The sum of those three angles in any triangle is A+B+C=180 degrees that means x+3x+8x=180 => 12x=180 =>x=15 degrees.The third angle C has 8x degrees that means 120 degrees.Problem solved:)