If ABC is an isosceles triangle and 60°

is question complete or incomplete .... if u r asking if abc is an isosceles triangle and one side is 60 degree find other .. if this is the question answer is below 
answer.....
let the angle b and angle c be x as in isosceles triangle 2 sides are equal and other is different  
given =
angle a = 60 degree 
angle b = x
angle c =x 
we know that sum of triangle is 180 degree 
so,
60 + x+ x  = 180 
60 +2x = 180 
2x =180 - 60 =110
2x=110 
x= 55 degree ans