Question

What is the value of y?

Answer 1

`\boxed{D. \: 40\degree}`

Explanation:

Angle sum property of triangle states that the sum of interior angles of a triangle is 180°

So,

`= > 2y \degree + (y + 10)\degree + 50\degree = 180\degree \\ \\ = > 2y\degree + y\degree + 10\degree + 50\degree = 180\degree \\ \\ = > 3y\degree + 60\degree = 180\degree \\ \\ = > 3y\degree = 180\degree - 60\degree \\ \\ = > 3y\degree = 120\degree \\ \\ = > y = (120\degree)/(3\degree) \\ \\ = > y = 40\degree`