Conversion: 5 3/8 = 5 · 8 + 3
8
= 43
8
Conversion: 3 7/8 = 3 · 8 + 7
8
= 31
8
Subtract: 43
8
- 31
8
= 43 - 31
8
= 12
8
= 3
2
Three colors * 8 possible sizes = 24 different shoes
The probability that the shoe is going to be a size 9 black shoe is 1/24.