Yes, it can. Consider that 15 and 50 are both divisible by 5, so 15/50 becomes 3/10.
38 over 50 simplified = 19/25
50/91 is already simplified.
15/43 is simplified.
It can not be simplified further.
Already simplified!
It is already simplified.
15/48 is simplified to 5 over 16
The simplified fraction of 15 over 63 is 5/21
It can't be simplified.
15/81 can be simplified to 5/27
4 over 15 is already simplified and can't be simplified further.