Answer:
The fraction of a year which Kurt attend music or swimming classes is
.
Explanation:
Given as :
The fraction of a year which Kurt attend music classes =

The fraction of a year which Kurt attend swimming classes =

Let The fraction of a year which Kurt attend music or swimming classes = The fraction of a year which Kurt attend music classes + The fraction of a year which Kurt attend swimming classes
or, The fraction of a year which Kurt attend music or swimming classes =
+

Or, The fraction of a year which Kurt attend music or swimming classes =

Or, The fraction of a year which Kurt attend music or swimming classes =

Hence The fraction of a year which Kurt attend music or swimming classes is
. Answer