The saying 'hindsight is twenty-twenty' means that it is easy to be knowledgeable about a situation after it has happened. It refers to being able to see an event more clearly when looking back on it, rather than when it was actually happening.
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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"
Oh, dude, you write 20000000 as "twenty million." It's like saying, "Hey, that's twenty million, no big deal." Just a bunch of zeros, but hey, it's all good.
20% 4 divided by 20 = 0.20 0.20 is 20% Four is one fifth of twenty. One fifth in a percent is twenty percent (20%), because percent means out of 100, and 100 divided by five equals twenty. If you would like to know why percent is called percent, it is actually very simple. PER - meaning out of, and CENT meaning 100. Out of 100.
Same as hindsight is 20/20.
If someone is one and twenty, they are one and twenty years old, or one plus twenty years old, or 1 + 20 or 21 years old. Another similar wording is "four and twenty black birds" from Sing a Song of Sixpence, the well known English nursery rhyme. In those couple of lines of verse, four and twenty blackbirds is four plus twenty blackbirds or 4 + 20 or 24 blackbirds.