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:
99 comments Page 4 of 10.
K. Jay Prakash Rao said:
1 decade ago
Let the son's present age be x years. Then, (38 - x) = x. -> why x is subtracted from 38?
2x = 38. -> how 2x = 38 its not mentioned in the question?
x = 19.
Son's age 5 years back (19 - 5) = 14 years.
2x = 38. -> how 2x = 38 its not mentioned in the question?
x = 19.
Son's age 5 years back (19 - 5) = 14 years.
Bhagyashri said:
1 decade ago
Father's age (38-x).
Son's age x.
Son's age before 5 years (x-5).
Father's age before 5 years (38-x) -5.
(38-x) -5 = (x-5).
33-x = x-5.
33+5 = x+x.
38 = 2x.
x = 19.
Therefore son's age before 5 years (x-5) = (19-5) = 14.
Son's age x.
Son's age before 5 years (x-5).
Father's age before 5 years (38-x) -5.
(38-x) -5 = (x-5).
33-x = x-5.
33+5 = x+x.
38 = 2x.
x = 19.
Therefore son's age before 5 years (x-5) = (19-5) = 14.
Khushi said:
1 decade ago
Father's age now is 38; let son's age be x.
Son's current age = age of his father on his birth.i.e. x.
If we subtract son's current age from father's current age ie x=(38-x).
We get father's age @ the time of son's birth which is x.
And we observe father's age @the time of son's birth = x = son's current age.
38-x = x.
Son's current age = age of his father on his birth.i.e. x.
If we subtract son's current age from father's current age ie x=(38-x).
We get father's age @ the time of son's birth which is x.
And we observe father's age @the time of son's birth = x = son's current age.
38-x = x.
Dhanendr said:
1 decade ago
I still not got exact intelligible meaning of that sentence told by father.
Suraj dalvi said:
1 decade ago
Father current year 38.
Son age consider x.
The sons age = father's.
Age at the time son's birth.
Father's present age - Son's age = Father's age
At the time of Son's birth.
38-x = x.
38 = x+x.
38 = 2x.
x = 38/2 .
x = 19.
Son's age 5 years back (x-5)=(19-5)=14 is correct answer !
Son age consider x.
The sons age = father's.
Age at the time son's birth.
Father's present age - Son's age = Father's age
At the time of Son's birth.
38-x = x.
38 = x+x.
38 = 2x.
x = 38/2 .
x = 19.
Son's age 5 years back (x-5)=(19-5)=14 is correct answer !
TITASH.810 said:
1 decade ago
How can we say that Both X is same variable?
I mean why 38-X = X,
Why not 38 - X = Y, where Y is Father's age.
At the time of Son's birth.
I mean why 38-X = X,
Why not 38 - X = Y, where Y is Father's age.
At the time of Son's birth.
Rabnawaz said:
1 decade ago
Don't write "x" just place the numbers the alphabetical symbols are quit disturbing.
Dattu said:
1 decade ago
Please explain confidentially.
Bindu said:
1 decade ago
38-x = x? Can any one explain in detail?
Pradeep Kumar Maurya said:
1 decade ago
38-x = x.
LHS RHS.
Keep the variable one side and numbers also a side,
We get,
38 = x+x (Because LHS-x when it will put on RHS then sign will be change as per rule).
Now, 38 = 2x.
38/2 = x (Here coefficient of x i.e. 2 will be denominator of 38).
19 = x.
You can say x = 19.
LHS RHS.
Keep the variable one side and numbers also a side,
We get,
38 = x+x (Because LHS-x when it will put on RHS then sign will be change as per rule).
Now, 38 = 2x.
38/2 = x (Here coefficient of x i.e. 2 will be denominator of 38).
19 = x.
You can say x = 19.
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