If 8 + 4 = 212; 9 + 3 = 312; 4 + 2 = 26; 8 + 2 = 410 then 5 + 1 = ?

Question

If

2    3 = 9
5    4 = 26
6    2 = 13

Then

7    4 = ??

Answer 1

56

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5/1=5 and 5+1=6, so it is 56

Answer 2

It follows the the logic:
8 + 4 = 212, first digit is 8/4 = 2 the other two digits 8 +4 = 12
9 + 3 = 312 first digit is 9/3 = 3 the other two digits 9 + 3 = 12
4 + 2 = 26 first digit is 4/2 = 2 the other digit 4 + 2 = 6
8 + 2 = 410 first digit is 8/ 2 = 4 the other two digits 8 + 2 =10
Then, 5 + 1 = ? first digit is 5/1 = 5 the other digit 5 + 1 = 6
The answer is 56

Answer 3

8+4=212: 9+3=312: 4+2=26: 8+2=410 then 5+1=56