Hey there!
Since you want to find out the amount of snowfall combined, add 5 1/2 and 3/8 . . .
1/2 = 4/8
3/8 = 3/8
4 + 3 = 7
( The denominator is the same so 1/2 + 3/8 = 7/8)
5 + 7/8= 5 7/8
5 1/2 + 3/8 = 5 7/8 <-----------
The amount of snowfall combined is 5 7/8 ft.
Hope this helps you.
Have a great day!