Aptitude - Problems on Ages - Discussion
Discussion Forum : Problems on Ages - General Questions (Q.No. 3)
3.
A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 38 years now, the son's age five years back was:
Answer: Option
Explanation:
Let the son's present age be x years. Then, (38 - x) = x
2x = 38.
x = 19.
Son's age 5 years back (19 - 5) = 14 years.
Discussion:
100 comments Page 4 of 10.
Ramya said:
1 decade ago
How can you subtract the past age of father from his present age to get get the present age of son? I can't get you.
Kavya said:
1 decade ago
How can we use same variable for both son's present age and father's age at the time of birth?
Naseem Ahmad Saifi said:
1 decade ago
"I was as old as you are at the present at the time of your birth" means that at the time of son birth father age was equal to present son age. So father age is now double of son age. Father's age now 38 year.
If son age is x then father's age = 2x.
Given that father's age = 38.
So, 2x = 38.
=> x = 19.
5 year back is x-5.
i.e 19-5 = 14.
If son age is x then father's age = 2x.
Given that father's age = 38.
So, 2x = 38.
=> x = 19.
5 year back is x-5.
i.e 19-5 = 14.
Krishna said:
1 decade ago
Here is the clarity:
Let present age of son = x.
Given father present age = 38.
According to logic when son age is 0 (during birth), fathers age is x.
Then when son's age is x, then father's age is 38.
So x-0 = 38-x.
2x = 38.
x = 19.
Then 5 years back of son's age it will be 14 years.
Hope you understood.
Let present age of son = x.
Given father present age = 38.
According to logic when son age is 0 (during birth), fathers age is x.
Then when son's age is x, then father's age is 38.
So x-0 = 38-x.
2x = 38.
x = 19.
Then 5 years back of son's age it will be 14 years.
Hope you understood.
Shahid said:
1 decade ago
38-x age of father at born time.
Dhanush said:
9 years ago
Son's age would always be half of father's age no matter what the father age is !
Because let say son age is 'x' now. When son born father age is also 'x'. So when son grew up and reach 'x', now father would be 2x.
So to find son age just divide fathers age by 2 (2x / 2 = x (son age) ).
Simple example: let say father age is 40.
0 x 20.
Son = <---------------->.
0 x 20 x 40.
Father= <-----------------><--------------->.
Then son ages - 5 = answer.
Because let say son age is 'x' now. When son born father age is also 'x'. So when son grew up and reach 'x', now father would be 2x.
So to find son age just divide fathers age by 2 (2x / 2 = x (son age) ).
Simple example: let say father age is 40.
0 x 20.
Son = <---------------->.
0 x 20 x 40.
Father= <-----------------><--------------->.
Then son ages - 5 = answer.
Narayan said:
6 years ago
@All.
Simply the calculation is; (father's present age - sons present age) = father's age at the time of birth.
But father's age at the time of the birth of his son = son's present age.
Simply the calculation is; (father's present age - sons present age) = father's age at the time of birth.
But father's age at the time of the birth of his son = son's present age.
Priya said:
9 years ago
@ALL.
X going to other side gives x and x give 2x here.
X going to other side gives x and x give 2x here.
Shano said:
9 years ago
How? Explain the solution.
Harini Murugan said:
9 years ago
let's use ratio method.
Father : Son
38 : X
X : 0
Now do cross multiplication.
i.e. 2X=38 => X=19.
Five years back, the son's age is 19-5=14.
Father : Son
38 : X
X : 0
Now do cross multiplication.
i.e. 2X=38 => X=19.
Five years back, the son's age is 19-5=14.
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