Question 492123
180 - x + 90 - x + x = 240
270 -x =  240 
30 degrees = x, The angle
60 degrees, the complement.
150 degrees, the supplement.
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30 + 60 + 150 = 240 degrees, the total of the three angles. 
Therefore, the average from the three angles will be 80 degrees.
Cleomenius.