Question

Three angles of a triangle are x ;x +10; 70 find two angles of triangle

Answer 1

All the angles of the triangle sum up to 180
so
x+x+10+70=180
2x+80=180
2x=100
x=50
so the two angles are 50 and 60

Answer 2

GIVEN the angles of the triangles are x ,x+10,and 70

we know that , x + [x+10] + 70 = 180      [ angle sum property of triangle]

                     =   2x + 80 = 180

                      =   2x  = 180 - 80

                     =     2x = 100

                     =     x  =  100/2=50 degree

hence the required two angles are 50, 50 + 10 =60