Hi,

Let x be the mesure of angle B.  Then angle A= x/2 and angle C= 1.5x



2x + x + 3x = 360

6x = 360

x = 60 degrees the measure of angle B

The measure of angle C = 1.5*60 = 90 degrees

checking our answer

60 + 30 + 90 = 180 = 180 

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