11 in binary notation is equivalent to the decimal number 3
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Numbers are unique and so the decimal number 11 is 11 and no second number.
Decimal 11 = binary 1011
0.11
11 (decimal) would be written in binary as 1011
To convert any fraction into a decimal, divide the numerator (top number) by the denominator (the bottom number). In this case you do 11/20 = 11 ÷ 20 = the required decimal.