When the son will be as old as his father today, the sum of their ages then will be 126. When the father was as old as his son is today, the sum of their ages was 38. Find their ages?
son's age : 30
father's age : 52
We shall represent the son's age 'today' by S and the father's age 'today' by F.
The first peace of information we have is that when the son's age(S+a few years) shall be equal to the father's present age(F), the sum of their ages shall be
we shall then note that S
We now say that in
So the first information we have is : S
The second information is that when the father's age was equal to the son's present age(father = F - a few year = S), the sum of their ages was
we shall then note that F
This means that
This information translated into math is : F
Solve equation (1) and (2) to obtain