Question Number 187176 by Rupesh123 last updated on 14/Feb/23
Answered by cortano12 last updated on 14/Feb/23
$$\frac{\mathrm{2}}{\mathrm{5}}\:=\:\frac{{r}+\mathrm{2}}{{r}+\mathrm{9}}\Rightarrow\mathrm{2}{r}+\mathrm{18}=\mathrm{5}{r}+\mathrm{10} \\ $$$$\Rightarrow\mathrm{3}{r}=\mathrm{8}\:;\:{r}=\frac{\mathrm{8}}{\mathrm{3}}\: \\ $$