The age of father 10 years ago was thrice the age of his son. Ten years hence, father’s age  will be twice that of his son. The ratio of their present ages is 

$$\begin{gathered} \text{ Let the ages of father and son }10\text{ years ago be }3x\text{ and }x\text{ years respectively. } \\ \text{ Then, }(3x+10)+10=2\left[\right(x+10)+10] \\ \Rightarrow 3\mathrm{x}+20=2\mathrm{x}+40 \\ \Rightarrow x=20 \\ \therefore \text{ Required ratio }=(3x+10):(x+10)=70:30=7:3 \end{gathered}$$