What should be added to 7 3/5 (a mixed fraction) to get 18 fast please 
 

Please find below the solution to the asked query:

Let we add  =  x  in $7\frac{3}{5} = \frac{38}{5}$ to get 18 , So
$$\begin{gathered} x + \frac{38}{5} = 18 \\ \Rightarrow x = 18 - \frac{38}{5} \\ \Rightarrow x =\frac{90 - 38}{5} \\ \Rightarrow x =\frac{\mathbf{52}}{\mathbf{5}}\mathbf{ }= \mathbf{10}\frac{\mathbf{2}}{\mathbf{5}} \end{gathered}$$
Therefore,

We add  = $\mathbf{10}\frac{\mathbf{2}}{\mathbf{5}}$                                                                  ( Ans )

Hope this information will clear your doubts about topic.