Question 1071050
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I + E = 180,   (1)
I = 3E.        (2)

Substitute expression (2) for I into equation (1). You will get

3E + E = 180  --->  4E = 180  --->  E = {{{180/4}}} = 45 degrees.

<U>Answer</U>.  Exterior angle is 45 degs.  Interior angle is 180 - 45 = 135 degs.
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Solved.