9+10

What you ask to find out if someone is stupid or not.

"Whats 9+10?"
"21"
"You stupid!"

9 + 10

Some would say its 19 but in fact its 21

Guy 1: What's 9 + 10
Guy 2: 21
Guy 1: no its 19
Guy 3: Bruh

9+10

Either 21 or 19

9+10=21