Question

please help me solve this

Answer 1

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Answer 2

AOB is straight line
(x+20)+(2x-20)+60 = 180
3x + 60 = 180
3x = 180 - 60
x = 120 ÷ 3
x = 40
angle COD
= 2x -20
=2×40-20
=80-20
=60