Answer :

four tenths is expressed as .4 
five thousandths is expressed as .005
the sum of these is .405 and divided by 2 (there are two numbers we added), we get .2025, that is the average
[tex](\frac{4}{10}+\frac{5}{1000}):2 = (\frac{400}{1000}+\frac{5}{1000})*\frac{1}{2} =\\ \\=\frac{405}{1000}*\frac{1}{2}=\frac{405}{2000}=\frac{81}{400}= .2025[/tex]


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