20/20 vision is when you can see things without difficulty from 20 feet away. It's average vision.
This the same question as "What does 'hindsight is 20/20' mean", which has already been answered.
It mean that you can look in the past (hindsight) and see what you did wrong. Perfect vision is 20/20. So as you look back, you're able to see "perfectly" what you should have done. "Hindsight is...
It refers to the 2nd version/generation of the internet.
Add up all the numbers together and then divide by 12 to find the average mean:-68/12 = 17/3 or as 5 and 2/3
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