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Aptitude - Problems on Ages - Discussion

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"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
- Albert Einstein
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:

 [A]. 14 years [B]. 19 years [C]. 33 years [D]. 38 years

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.

 88Gguyu said: (Fri, Jul 23, 2010 09:32:03 AM) What is meaning of "I was as old as you are at the present at the time of your birth".

 Shruthi said: (Sun, Aug 1, 2010 03:27:30 AM) The meaning was "at the time of son's birth, father age was son's present age".

 Shan said: (Sat, Aug 21, 2010 01:19:33 AM) The meaning is [if father age is 30 @ past then son age is 0] ----- Then [if son age is 30 @ present then father age is 60] that is -------- The explanation... See that (the past age of father= the present age of son)

 Goud said: (Fri, Aug 27, 2010 01:05:13 PM) The meaning is ' the sons presant age= father's age at the time son's birth

 Karthick said: (Tue, Aug 31, 2010 05:56:38 AM) Meaning of 38 - x = x ?

 Sriram said: (Sat, Oct 2, 2010 12:28:13 PM) @ Karthik Father's present age - Son's age = Father's age at the time of Son's birth.

 Prachi said: (Fri, Dec 10, 2010 09:13:17 PM) Thanks dear.........

 Prasath said: (Thu, Jan 27, 2011 07:08:21 AM) Meaning of 2x = 38.

 Vijaykumar said: (Sat, Feb 5, 2011 05:53:02 AM) 2x=38 ?

 Shikha said: (Sat, Feb 12, 2011 01:35:35 PM) (38-X)=X so X taking other side negative becmes positive X.so 2X 38-X=x 38=2x x=19

 Nijin said: (Wed, Feb 23, 2011 10:36:08 AM) Thank you friends.

 Gayu said: (Mon, May 30, 2011 10:28:53 AM) Thank you my friends.

 Stella said: (Wed, Jun 15, 2011 01:52:59 AM) Friends, I have one doubt. Father's present age-son's age=father's age at the time of son's birth. 38-x=x. Here son's age & father's age at the time of son's birth both are assigned to x. How is it possible? why we can't take two variables?

 Vivek Jain said: (Thu, Jun 30, 2011 05:28:12 AM) 38-x=x means that after substracting x(son's present age) from 38(father's current age),we will get the fathers age at the time of his son's birth and which was also x.

 V.Prasanthi said: (Sun, Oct 9, 2011 07:43:24 PM) Take three reverse number is descending order. Now reverse the result and add the reversed number with the original. You will get 1089 as the answer. [A] 765 567+198;198+891+1089 [B] 129 921+891;891+198+1089 [C] 225 522+729;729+927+1089 [D] 139 931+991;991+199+1089

 Anandraj N said: (Mon, Nov 7, 2011 01:46:09 PM) Can we assign X to both father and sons age ie., (38 - x) = x ?

 Vijay said: (Wed, Nov 23, 2011 09:35:01 PM) How did 2x come into picture?

 Priya said: (Mon, Dec 5, 2011 05:52:45 PM) (38 - x) = x? How it came? Can't get that.

 Vignesh said: (Wed, Dec 14, 2011 03:37:45 PM) @stella you are right.

 Sharanya said: (Fri, Jan 6, 2012 09:46:22 AM) @priya. The son is as old as his father was at the time of his (sons) birth. Thus if you subtract the sons present age from the fathers present age you will find the age of the father at the time of the sons birth ie 38-x. This must be equal to the sons present age. Hence 38-x=x.

 Ramya said: (Fri, Jan 20, 2012 11:59:34 AM) Thank you.

 Mercy said: (Wed, Jan 25, 2012 06:00:43 PM) Son's age is exactly to half to the fathers age, suppose if fathers age is 38 then sons age is 38/2 i.e, 19 and 5 years back his is 19-5 =14.

 Anirudh said: (Mon, Jan 30, 2012 09:12:17 PM) See, let any variable x be the age of son. The fathers age is equal to sons present age wen the son was born. So if you deduct the sons age ie 38-x it shows the faters age when the child was born and eqating to x shows the childs present age so it is a valid result :)

 Lavanya said: (Sat, Jun 2, 2012 08:59:17 AM) @stella. It was clearly given in the question that "I was as old as, you are at the present, at the time of your birth". Means son present age= father age at the time of son birth. So, for these two we have to assign same variable.

 Preshkitha said: (Tue, Jun 5, 2012 09:01:39 PM) We can't take two variables because present son's age is equal to the age of father when the son was born. Okay. ?

 Kusuma said: (Wed, Jun 20, 2012 08:40:57 PM) How can we tell that the son age is exactly half to his father age and not any other option.

 Guru Praveen said: (Sun, Jul 15, 2012 12:02:38 AM) Hi Friends, In the question itself it is clearly said Son's Present age is same as Father age at the time of his son's birth. So sons age will be half the age of father at any time. So if sons age is x, then father age is 2x. Given father present age is 38, so obviously son's present age will be half of father's hence sons age is 38/2 which is 19 years. Sons age before 5 years is 19-5=14.

 Nayak said: (Sat, Sep 15, 2012 11:05:27 AM) Hello Everyone I like everyone the way u think all guys. Really it help me a lot to analyze the problems.. thanks