Hello aspirant,

Let the son's present age be x. Then the father's age is x+30.

After 5 years :

Son = x+5, Father = (x+35)

Their product is 400:

(x+5)(x+35) = 400

x^2 + 40x +175 =400

x^2+40x-225 = 0

Solving gives x=5.

So the son is 5 years old and the father is 35 years old.

FOR REFERENCE : https://school.careers360.com/articles/math-question-solver

Hope the details will help you.

THANK YOU

Hello aspirant,

Let the son's present age be x. Then the father's age is x+30.

After 5 years :

Son = x+5, Father = (x+35)

Their product is 400:

(x+5)(x+35) = 400

x^2 + 40x +175 =400

x^2+40x-225 = 0

Solving gives x=5.

So the son is 5 years old and the father is 35 years old.

FOR REFERENCE : https://school.careers360.com/articles/math-question-solver

Hope the details will help you.

THANK YOU