A triangles angles add up to 180 degrees. 
So if you have 24 degrees + 36 degrees = 60 degrees 
180 degrees - 60 degrees = 120 degrees 
So x = 120 degrees. 
Obtuse triangles - 1 obtuse angle (greater then 90 degrees) 
Acute triangles - have all 3 acute angles. (Less then 90 degrees) 
Right triangle - has 1 90 degree angle. 
So, in this triangle, it fits under the Obtuse triangle because there is 1 obtuse angle. 
Conclusion: x = 120 degrees. The triangle is an obtuse triangle.