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Adding water to a substance or adding milk(i think) to sugar.
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we need to know the units of 20. Is it grams, kilograms, %...
A half life may or may not be a fraction. The half life of carbon 14, for example, is 5715 years - not really a fraction, unless you are thinking in terms time periods which are much longer than a year.
The half-life of a radioactive nuclide when 95% of it is left after one year is 13.5 years. AT = A0 2(-T/H) 0.95 = (1) 2(-1/H) ln2(0.95) = -1/H H = -1/ln2(0.95) H = 13.5