1 answer
(click or scroll down)
Since the two angles are supplementary, their measures add up to 180 degrees.
(x + 16) + (3x) = 180
4x + 16 = 180
4x = 164
x = 41
So, the measure of ∠SRT is 3x = 3(41) = 123 degrees. Answer: \boxed{123}.