Question

find x (x+3)degree (x+20)degree (x+7)degree

Answer 1

(x+3)+(x+20)+(x+7)=180' [straight line]
3x+30=180'
3x=180-30
3x=150
x=150/3
x=50

Thus (x+3)=50+3=53'
(x+20)=50+20=70'
(x+7)=50+7=57'

Answer 2

here is the required answer for the given question