Question

the angle of a triangle are (X-20),(x-40) and (1/2x-20). find the value x

Answer 1

x-20+x-40+1/2x-20=180
5/2x-80=180
5/2x=260
5x=520
x=520/5
x=104

Answer 2

here your solution
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there are three angle

(x-20), (x-40), (X/2-20)

we know that
sum of all triangle = 180°

then

x-20 +x-40 + X/2 -20 = 180°

2x+X/2 -80 = 180°

5x/2 = 180° +80°

5x = 260× 2

X = (260×2) / 5

X = 52×2

X = 104°

➡(x-40) = (104-40) = 64°
➡(x-20)=( 104- 20 )=> 84°
➡(X/2 -20) =( 104/2 -20) => 52-20 =32°

hope it's helpful ✌☺