Can you solve this simple looking equation in 30 seconds by remembering the math class rule

See if you can recall math lessons from school to get to the bottom of this sum that has left people confused.
Fairbanks Daily News-Miner

The fad that won't fade: '6 7' explained

If you hear someone blurt out “6 7” as they move their hands up and down rapidly, don’t be surprised. It’s just one of the ...