What is mZG?
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Step-by-step explanation:

Sum of all the angles of a triangle = 180

x + 3x + 25 + x - 5 = 180

x + 3x + x + 25 - 5  = 180

                 5x + 20 = 180

                        5x   = 180 - 20

                        5x   = 160

                            x = 160/5

x = 32

∠G = 3x +25

     = 3*32 +25

     = 96 + 25

∠G = 121°

X=32

G=89°

Step-by-step explanation:

sum of angles in a triangle is 180°

x+x-5+3x+25=180

X+X+3x=180+5-25

5x=160

divide both sides by 5

we will get

X=32

angle G= 3x+25

=3(32)+25

=96+25

= 121°