In a triangle the second angle is twice the first angle and the third angle is 20 less than the first angle find the measure of all three angles?

Remember the sum of the 3 angles of a triangle = 180degrees

Let angle 1 = x

angle 2 = 2x

angle 3 = x-20

Sum = x + 2x + x - 20 =180o

4x - 20 = 180o

4x = 200o

x = 50o

2x = 100 o

x - 20 = 30o

angle 1 = 50o

angle 2 = 100 o

angle 3 = 30o