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20 cm equals all these things: 2 decimetres 200 milimetres .2 metres and many other things.
The number of permutations of 20 things taken 20 at a time is 20 factorial or 2,432,902,008,176,640,000.
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.
20 inch=0.555... yard (you can let google calculate these things for you, just enter '20 inch to yard' in the search box)
many things 85/100 =17/20 for example so does 170/200 and 340/400