Age of the Father is 3 times that of his son, 5 years back, he was 4 times his son, what is the age of his son now ?

we can set up an equation based on the information: 3x – 5 = 4(x – 5).

Let’s solve the equation:

Distributing 4 to (x – 5):

3x – 5 = 4x – 20

Subtracting 3x from both sides:

-5 = x – 20

Adding 20 to both sides:

15 = x

So, the age of the son now is 15 years.