Answer:

The present age of the son is 5 years.

Step-by-step-explanation:

We have given that,

The ratio of the present ages of father and son is 6 : 1.

Let the common multiple be x.

∴ Father's present age = 6x years

And son's present age = x years

Now,

After 5 years, father's age = ( 6x + 5 ) years

And after 5 years, son's age = ( x + 5 ) years

From the given condition,

∴ The present age of the son is 5 years.