Question

Please explain the answers you give

Answer 1

Sum of all angles in a straight line = 180

Here.

=> 7x + 20 + 3x =180

=> 10x = 180 - 20

=> 10x =160

=> x = 16

Answer 2

7x+20+3x=180 (linear pair)
10x+20=180
10x=180-20
10x=160
x=160/10
x=16
angle XOZ=7x+20
=7 (16)+20
=112+20
=132
angle ZOY=3x
=3 (16)
=48