Aptitude - Problems on Ages - Discussion

Why can't we do like this:

(2+2x) =24.
2x = 24-2.
2x = 22.
x = 11.

So then twice will be 22.

Why we adding x+2 in left side?

Answer is 20 because after getting value of x which is age after 2 years is 22. So from 22-2=20 is age and his father is 24.

It can be also solved by this? please reply me !

Let the son age be x.
After 2 years he will be twice of his son age..
Then..
2x+2=24.

x=11 then x= 11 the son's age and his father age 2x=2*11 = 22.

From my point of view answer is 20 years old because 22 years is calculated 2 years later. So the present year is 20 what you say guys. Correct me if I am wrong.

Thank you.

Why we multiply 2 with sons age why not with fathers age because father age will be twice?

No @Jeeva.
Son age is x.
Father age is x+24.

After 2 years,
Father's age = twice of his son's age.

So, (x+24) +2 = 2(x+2).
x+26 = 2x+4.
So, x = 22.

This is the required answer.

Keep smiling..

Hey I have one doubt, in question itself they given that father age is twice the age of son. So it will be like this only 2(24+x+2) = (x+2)?

In this question the basic technique is to emphasise on son rather than on father as the whole question (see it carefully) revolves around the.

Age of the son.

So lets sons age be 'x'.

Now according to the condition.

Father's age will be 24+x.

And after 2 years hence (means after 2 years).

Father's age will become (24+x+2).

And sons age will become (x + 2).

Now fathers age is twice more than sons age.

To make lhs = rhs.

We will multiply 2 not with the current age of father but with the current age of son (important point).

So 2(x + 2) = 24 + x + 2.

So value of x = 22.

So sons age is '22'.

@Lakshmi.

Man is 24 year older than his son.
Let sons age be X.

Dads age is 24 year older than his son so it is X+24.
Sons age = X.
Dads age = X+24.

After 2 years both father and sons age will be increased by 2.

X+2 = X+26

(Lakshmi here only you have got confused, fathers age is twice sons age means FATHER=2*SON, if sons age is twice the fathers age means your argument is correct, it will be SON=2*FATHER).

Since fathers age is twice the sons age its(X+26) = 2(X+2).

Hope you got it.