A father is four times as old as his son now. If 5 years later the father is 3 times as old as his son's age. What are their present ages

The Present age of father is 40 years

The Present age of son is 10 years

Step-by-step explanation:

Given as:

Let the age of father = F years

The age of son = S years

According to question

F = 4 * S ... 1

And

(F + 5) = 3 * (S + 5)

F + 5 = 3S + 15

Or, F - 3S = 15 - 5

Or, F - 3S = 10 ... 2

From Eq 1 and Eq 2

4S - 3S = 10

∴ S = 10 years

Put the value of S in eq 1

So, F = 4 * S = 4 * 10

∴ F = 40 years

Hence The Present age of father is 40 years

And The Present age of son is 10 years Answer