The two angles form a straight line of 180 degrees.
This means they add to 180
115 + (4n-5) = 180
4n+110 = 180
4n = 180-110
4n = 70
n = 70/4
n = (35*2)/(2*2)
n = 35/2 is the answer as a fraction
n = 17.5 is the answer in decimal form
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