Define variables

Let Lavanya's present age be $x$ years. The age at the time of her marriage 10 years ago was $(x - 10)$ years.

$Age_{marriage} = x - 10$

Set up the equation

According to the problem, her present age is $1 \frac{1}{5}$ (which is $\frac{6}{5}$) times her age at the time of marriage.

$x = \frac{6}{5}(x - 10)$

Solve for x

Multiply both sides by 5: $5x = 6(x - 10) \implies 5x = 6x - 60 \implies x = 60$. So, Lavanya's present age is 60 years.

$x = 60$

Find the son's age

The son's present age is one-tenth of her present age.

$Age_{son} = \frac{1}{10} \times 60 = 6$