we know that
-7 1/8 on Monday
-1 7/8 on Tuesday
+13 on Wednesday
so
Adds the given numbers
but first
Convert the mixed numbers to an improper fractions
7 1/8=7+1/8=57/8
1 7/8=1+7/8=15/8
so
-(57/8)-(15/8)+13
-(72/8)+13
-9+13
+4
therefore
The answer is a gain of 4 points