How much does one need to add to $$\frac{4}{5}$$ to obtain $$\frac{5}{4}$$ ?
The correct option is D.
 $$x$$ + $$\frac{4}{5}$$ = $$\frac{5}{4}$$
$$\Rightarrow$$ $$x$$ = $$\frac{5}{4}$$ - $$\frac{4}{5}$$Â
          = $$\frac{25-16}{20}$$ = $$\frac{9}{20}$$
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