the picture in the attached figure
we know that
Total fraction of blue segments=fraction of blue segments circle 1+
fraction of blue segments circle 2
step 1
find the fraction of blue segments circle 1
total segments=8
blue segments=4
fraction of blue segments=4/8
step 2
find the fraction of blue segments circle 2
total segments=8
blue segments=3
fraction of blue segments=3/8
step 3
Total fraction of blue segments=4/8+3/8----> 7/8
the answer is 7/8