An obtuse triangle can have no right angles, and has two equal angles.
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
it can have 1 if it is a right triangle.
No right triangle can have any obtuse angles inside it.
A triangle can have at most one right angle.
A triangle can have a maximum of 1 right angle!
The most right angles a triangle can possibly have is 1. Any more than that, and it has to be a quadrilateral.