Question

7+3=28. 9+1=810,8+6=214,5+4=19,7+3=??

Answer 1

$5 + 3 = 28 \\ 9 + 1 = 810 \\ 8 + 6 = 214 (8 - 6 = 2)(8 + 6 = 14)\\ 5 + 4 = 19(5 -4 = 1)(5 + 4 = 9) \\ 7 + 3 = 410(7 - 3 = 4)(7 + 3 = 10)$