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 20/20"
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Same as hindsight is 20/20.
When someone says "hindsight is 20-20" it means that looking back (hindsight) at a situation or an event we have a clearer understanding of it and how things could have been done better. 20-20 refers to good eyesight.
Do You mean 20-20 vision?
20% = 20/100.
If you mean 20% then it is 3600