Prathima's age is 4 times the age of her son. Find the son's age if the sum of their ages is 40 years.
Let the age of the son = x years
∴ Age of Prathima is 4 times the age of the son = 4x years.
age of the son = 4x years.
Sum of their ages = 40 years
∴ Son's age = x years = 8 years.