Answer :

[tex]\frac{4}{5b}=16 => 5b= \frac{4}{16} \\ \\ <=>5b=\frac{1}{4} <=> \\ \\ <=>b=\frac{\frac{1}{4}}{5}= \frac{1}{4}*\frac{1}{5}=> \\ \\ =>\boxed{b=\frac{1}{20}}[/tex]

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