Question

4) Rahul's father is four times as old as Rahul. After five years, father
will be three times as old as Rahul. Find their present ages.​

Answer 1

Answer:

Let the present age of Rahul be x so age of Rahul's father be 4x

so

$3(x + 5) = 4x + 5 \\ 3x + 15 = 4x + 5 \\ 15 - 5 = 4x - 3x \\ 10 = x$

$age \: of \: rahul = 10 \: years \\ age \: of \: his \: father = 40 \: years$