Answer: The correct answer is D, y = 40
Step-by-step explanation: The first thing to note is the rule stating that sum of angles in a triangle equals 180 degrees. We have been given three angles which are, 2y, y+ 10 and 50.
If the sum of the angles in a triangle equals 180, then
2y + (y + 10) + 50 = 180
2y + y + 10 + 50 = 180
3y + 60 = 180
Subtract 60 from both sides of the equation
3y = 120
Divide both sides of the equation by 3
y = 40.
