A bag contains purple and orange marbles.Sam randomly takes out one marble and then returns it to the bag.He does this 18 times,
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x = 80
the sum of the angles round a point is 360°
the 3 angles here must sum to 360°
3x + x - 27 + 67 = 360
4x + 40 = 360
subtract 40 from both sides.
4x = 360 - 40 = 320
divide both sides by 4
x = = 80
thus the 3 angles are 67°, 240° and 53°