RRB Group-D Model Paper 19 with answers for online practice

Let the age of the son be x.
⇒ Age of father = 4x + 2
Age of father after 3 years = 4x + 5
Age of son after 3 years = x + 3
According to problem, father’s age after 3 years = 15 + 2(x + 3)
Equating the two ages of the father, we get
4x + 5 = 15 + 2(x + 3)
2x = 16
x = 8
Therefore, age of son is 8 years.