Whats 9 plus 10

Answer 1

21 *gets smacked and called stupid*

Answer 2

19

The joke answer is 21 but not mathematically accurate

ps if you posted as a joke, it's very old and already been done to death

Answer 3

its 910 because you put a 9, then you add a 10 next to it. Boom quick maffs

Answer 4

its 69 cause 6+9+6x9=69 so its obviously 69

Answer 5

19

Answer 6

21