20 is a number above the decimal point, so writing it as a decimal is not really possible. You could write 20.0 and include the next numbers place, but it's the same number.
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.20
Expressed as a decimal, 10/20 is equal to 0.5.
20 hundredths = 0.20
20/1000th = .020
It is: 1/20 = 0.05