The measure of one angle is twelve more than three times a number . Another angles is twice the first angles measure. The sum of the measures of the angles is 450 degrees

Answer 1

3n + 12 + 2(3n + 12) = 450

3n + 12 + 6n + 24 = 450

9n = 414

n = 46

3(46) + 12 = 138 + 12 = 150

450 - 150 = 300