the first angle of the triangle is three times as large as the third. The measure of the second angle is 20 % more than that of the third. How large is the second angle?

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The sum pf the 3 angles in a triangle is 180 let the angles be a,b,c a=3c b=c+c/5 So 3c+c+c/5+c=180 Solve for c and then solve for b which is your second angle