Question

the present age of Sonu is one third of his father's present age after 4 years the sum of their age will be 60 years the present age of Sonu is​

Answer 1

Let present age of Sonu be x years

As per the first condition, Sonu's father's present age will be 3x

After four years the sum of their ages is 60

i.e (x+4) + (3x+4)=60

So, 4x +8=60

4x = 52

x = 13

So Sonu's present age is 13 years

Answer 2

$\textbf{\huge{ANSWER:}}$

$\sf{Given:}$

Sonu's age is one third ($\frac{1}{3}$) of his Father's age

After 4 years, their sum of ages will be = 60

$\sf{Solution:}$

Let the age of Sonu's father be = x

Then Sonu's age = $\frac{x}{3}$

According to your question, after 4 years :-

Sonu's father's age = x + 4

Sonu's age = $\frac{x}{3}$ + 4

Now :-

=》 x + 4 + $\frac{x}{3}$ + 4 = 60

Solve it further

=》 $\frac{3x+x}{3}$ = 60 - 8

Some more steps to go

=》 $\frac{4x}{3}$ = 52

Take all the constants to the R.H.S.

=》 x = $\frac{52\times3}{4}$

Divide

=》 x = 13 × 3

Multiply and Get the answer

=》 $\tt{x = 39}$

We found by calculation :-

Sonu's father's age = 39 years

Sonu's age = $\tt{13\:years}$