The sum of the interior angles of a triangle is 180 the second angle of a triangle is 45 more than the first and the third angle is twice the first

First angle is x

x + (x + 45) + 2x = 180

4x + 45 = 180

4x = 180 - 45 = 135

x = 135 divided by 4

x = 33.75

first angle 33.75

second angle 78.75

third angle 67.5

checking

33.75 + 78.75 + 67.5 = 180