Based on the figure angle J is 124 degrees
What is CPCTC?
CPCTC means Corresponding Parts of Congruent Triangles are Congruent.
When two triangles are proven to be congruent, CPCTC allows us to make conclusions about the corresponding parts (angles and sides) of those triangles.
Using this for the two triangles, we can say that angle J is the correponding part of angle k and hence their angles are equal