IF 3+5+6=151872 5+5+6=253094 5+6+7=303585 5+5+3=251573 9+4+7=?

Question

If
5 + 4 => 9
3 + 5 => 9
9 + 1 => 9
1 + 6 => 8
4 + 2 => 8
1 + 7 => 7
5 + 6 => 6
3 + 7 => 3
7 + 0 => 0
Then
8 – 1 => ??

Answer 1

9+4+7=366329
It is solved as
9x4=36
9x7=63
these gives us first 2 sets now add both and subtract the last figure
36+63-7=92
now reverse it it will become 29

proof
5+5+3=251573
5x5=25
5x3=15
these give us 2515
now to calculate for last 73
25+15=40
and now subtract last digit that is
40-3=37
and reverse it will become 73