It means less then 21 yet more than 19.
20 refers to the power of the tractor not the age
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Do You mean 20-20 vision?
20% = 20/100.
If you mean 20% then it is 3600
Yes. For example, the mean of: 10,20,20,20,20,30 is (10+20+20+20+20+30)/6
a square 20 units long and 20 units wide