If 3 + 5 = 21, 8 + 3 = 80, 9 + 5 = 117 and 1 + 3 = 3 then 6 + 4 = ?

Question

If
6 + 4 = 210
9 + 2 = 711
8 + 5 = 313
5 + 2 = 37
7 + 6 = 113
9 + 8 = 117
10 + 6 = 416
15 + 3 = 1218
Then
?? + ?? = 123

Answer 1

54

---

3 + 5 = 21 --------> 3*(3+5-1)=3*7=21
8 + 3 = 80 --------> 8*(8+3-1)=8*10=80
9 + 5 = 117 --------> 9*(9+5-1)=9*13=117
1 + 3 = 3 --------> 1*(1+3-1)=1*3=3
6 + 4 = ? --------> 6*(6+4-1)=6*9=54