Question

if 2+7 =34
8+9 =18
6+3 =76
then why would be
5+7=?

please send the answer with logic and reason

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Answer 1

5+7=64
=twice of 7=14,the unit place =4
=successor of 5=6
So the answer is 64.
Because
2+7
= twice of 7=14, the unit place. (4)
= the successor of 2 (3)
So it's 34.
8+9
=twice of 9=18,the unit place (8)
= as here 8is the predecessor of 9 so here it is 9-8=1
6+3
=twice of 3=6,(6)
=successor of 6=7