Question

13. In the given figure, AOB is a straight line.
If angle AOC = (3x - 10) and angle COD=50 degree
and angle BOD = (x+20)
then angle AOC=?
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Answer 1

angle AOC + angle COD + angle BOD = 180°................... (straight line angles)

3x - 10 + 50 + x +20 = 180

4x +60 = 180

4x = 120

x = 30

therefore, angle AOC = 3(30) - 10 = 90 - 10

= 80°

Answer 2

$\bold\red{hi}$