Question 992150
.
Let  x  be the measure of the given angle in degrees.


Then the supplement angle is  (180° - x).


The complement angle is  (90° -x),

and the supplement to the complement angle is   180°-(90°-x) = 90°+x.


So you have an equation 


(180-x) + 60 = 2*(90+x).


Simplify and solve it:


180 - x + 60 = 180 + 2x,


3x = 60,


x = 20°.