Observe the patterns and fill in the blanks:
116+9=116+10-1=115+10
116+99=116+100-1=115+100
116+999=116+1000-1=115+________________
116+9999=116+10000-1=115+_____________________
In the given figure, if ∠AOC=130∘, then the value of ∠ABC = _______.