Question 691098
Two angles are supplements when they add up to 180
Two angles are complements when they add up to 90

First, set up the equation
{{{(180-X)/2 + 25 = 3*(90-X)}}}
Now simplify the equation
{{{90 -X/2 + 25 = 270 - 3X}}}
Combine like terms
{{{115 -X/2 = 270 - 3X}}}
Add 3X to both sides
{{{115 + 2.5X = 270}}}
Subtract 115 from both sides
{{{2.5X = 155}}}
Divide both sides by 2.5
{{{highlight(X = 62)}}}