Logic Puzzles - Comments:
Mr.
if mother's age is X and child's age is Y
then
X = Y+21 ...................(1)
in 6 years time:
X + 6 = 5 (Y+6)
thus, x = 5Y + 24..............(2)

from (1) and (2)

4Y + 3 = 0

thus Y (the child's age)= -3/4 = (i.e minus 3 qourters of the complete year= minus 9 months!!)
#1 - Muhammd Ali - 10/11/2007 - 20:49
That would mean that the father is in the mother.
#2 - Logician - 10/16/2007 - 05:13
good one
this is confusing really confusing
#3 - the great trizu - 10/16/2007 - 11:54
yeha this is my favorite!
yeah they are in the process of concieving the baby because it is 9 months before the baby is born
#4 - Joecool - 10/17/2007 - 11:40
this is dumb
if they are in the process of concieving the baby then how could she be 21 years older than the child , when technically,THERE IS NO CHILD
#5 - wol - 10/27/2007 - 00:29
oh nice.
#6 - laaaaaaaalala - 10/27/2007 - 14:44
what if the child is born early or late?
#7 - kk - 10/30/2007 - 14:54
Well...
This problem is idiotic, oh well.
#8 - Dan - 11/17/2007 - 13:53
yea
life begins at the moment of conception!
#9 - kyle - 11/19/2007 - 16:02
Life begins at the moment of conception... that is relevant here why? Because you can't help yourself from spouting it out? Too bad your mother didn't abort you.
#10 - Val - 11/20/2007 - 22:26
a pregnancy lasts 40 weeks - TECHNICALLY 10 months... so the problem really is wrong...
#11 - amanda - 11/23/2007 - 11:30
There are 52 weeks in a year amanda, not 48. A month is not a perfect 4 weeks. Closer to 4.33 weeks per month. Sooo..... TECHNICALLY.... a pregnancy lasts 9 months. Just sayin...
#12 - smarter than amanda - 11/29/2007 - 21:12
what if the child is born early or late? [2]

you got a point there.
#13 - Felipe - 12/02/2007 - 14:17
WOW
Wow you guys, its just a question,if there is a problem then dont do the question.
#14 - Dylan - 12/03/2007 - 06:01
The question is flawed in several ways and insolvable purely by logic. First, age is not a vector; even thoughyou can be less than an attosecond old, you can not be less than zero years old. Further, a child is not necessarilly conceived nine months before birth and the father need not be present at conception (sperm can live several days after ejaculation; not even counting artificial methods). It might be likely that the father is with mother but not necessary.
#15 - bebe - 12/06/2007 - 21:25
querr
it dosent make sence
#16 - penss - 12/21/2007 - 11:21
Hmm...
child = X in 6 yrs child = X + 6
mother = X + 21 mother = (x + 21)+ 6 OR 5(x+6)

x+27 = 5(x+6)
solve for x gives you -3/4 or -9 months

i got the math part but couldnt we also say that -9 months means that she is about to deliver? wont the "-" sign just mean that the baby is not yet born. once the baby is born, its technically 0 yrs and starts all over into the positive #'s. similar to a number line. i'd like to hear thoughts on this.
#17 - coco - 12/23/2007 - 12:39
The boy was born on February 29th. The father is the child itself.
#18 - Carol - 12/27/2007 - 10:05
Nah
Nah u r all swots and knob heds
#19 - Poo - 01/23/2008 - 12:10
Maths is so so so so coolio
Don't say that about maths its my only friend and i luv knob
#20 - Danny Johnson - 01/23/2008 - 12:12
sigh
where is the father ?
the father is inside the mother
dont get technical and rip it all apart.
x
#21 - leash - 02/21/2008 - 06:05
silly
this question needs different wording. I agree that there is no child.
#22 - grace - 02/24/2008 - 22:13
Correct Answer
Mother and Father were making love :) because of which the child came into this world :)
#23 - shario - 03/02/2008 - 20:28
wow
wow you guys are all really thinking too hard. the father is in the title.
The Father
#24 - crzy - 03/19/2008 - 18:57
Missing the point?
When a simultaneous equation leads to theolgical or ethical debates it makes me wonder if some people have really missed the point of what a puzzle is. Such constructs are devised purely for the sake of the puzzle. In some cases the wording or the scenario may confuse, but if the puzzle read "where is a child's father in relation to the child's mother at the point of conception?" then it wouldn't be a puzzle, it would be a question. And where's the fun in that...?
#25 - Lleyton Quinn - 03/31/2008 - 13:52
kool
this is a very interesting puzzle... i am doing this in school and felt likr riting a commenrt.


gsup
#26 - bobby - 04/11/2008 - 09:15
Cute
Cute problem. And I wholeheartedly agree with Lleyton (#25).

Note to some of the other posters above: You see, when your algebraic manipulations spit out the number -3/4, that's the part where you're supposed to suddenly realize that's 9 months in the future and chuckle as you visualize good ol' Dad rummaging through his sock drawer searching (unsuccessfully) for a condom.

Happily, logical pursuits do not require you to abandon your sense of humor. Assuming you have one. =:)
#27 - G.R. - 04/16/2008 - 02:30
problem
If you convert the years to months before doing any more math its pretty easy, but it should read "a mother will be 21 years older than her child"(it would probably give the answer away tho) because she is currently not 21 years older than her child, if you say life begins at conception thats fine, she would still be 20 years and 3 months older the child at conception (in the present). She WILL be 21 years older, she IS NOT now. I only bring this up, because in problems like these, the wording often needs to be taken completely literally to solve the problem.
#28 - matt - 04/26/2008 - 03:11
3 kids and found this one stupid
the only way this is possible is if mommy is conceiving this baby very soon after her 21st birthday because if not then she will turn 22 before baby is born personal experiance talking
#29 - angel - 05/11/2008 - 16:39
Deep Thinker
This is really stretching the imagination too far. The child is not even conceived let alone being born. What if there were to be twins or more - would the question be worded as 'child'? What if the woman can't conceive? What if the Man was impotent?

Though I got the age of child right (- 3/4 year), I dismissed it as how can anyone be less than 0 years old
#30 - GB - 05/25/2008 - 13:00
It's not even a matter of stretching the imagination too far. The conclusion simply cannot be deduced based on the premises.
#31 - Joshua J. Oakley - 06/10/2008 - 20:50
DEAD
what if she she went to a sperm bank to get fertilised. they could be frozen for years, so the the father could have died a long time ago.
#32 - adam - 07/23/2008 - 16:18
Very good
I personally thought this was quite clever. As for the waffle about sperm banks or twins etc. It is just a puzzle (and a funny one at that).

Well done.
#33 - Joe Bloggs - 07/26/2008 - 07:29
stupid
so what's the answer about the question "where's the father?"
#34 - ggg - 08/09/2008 - 01:52
Far away!!!
Conception is actually considered the 2nd week of pregnancy. The first day of your menstral period is counted as the first day of your pregnancy. Therefore, mom was on the rag meaning dad was probably far, far away....

But a funny puzzle, none the less!
#35 - Richard - 08/14/2008 - 13:09
the answer
if the mama is 21 years older than the child would have to be 1 and the mama would be 24 because in exactly 6 years she would be 5 times older than her which that means the child would have to be 6 or 7 depending on her birthday.
#36 - Raquel Merriweather - 08/16/2008 - 12:59
i mean
i mean one or or zero dependeding on both the child and mother's birthday or if the child is even born.
#37 - Raquel merriweather - 08/16/2008 - 13:02
how does wheres the father fit into the question? i dont get it? am i the only one that doesnt understand why it says wheres the father? its like saying "a son is 3 quarters the age of his mother. wheres his pants?" this question is BS
#38 - fernando corral - 08/19/2008 - 12:20
what in the world???
guys that is so cross the father cannot be the child that is so gross and this problem does not even seem accurate and everything and if the baby is born early or late then well its born that way and you cant do anything about it!!!!! you all are taking this way to seriously!!!!
#39 - No need to know - 08/25/2008 - 16:46
wat?
all im gonna say is wat? becuz i go 2 a catholic school and my teacher gave me this question to do, and im gonna guess that eighter she didnt read all the questions and answers before hand or that the answer to the question where is the father, was not the ones given above.
#40 - nina - 09/04/2008 - 07:36
Dumb!
Maybe shes a whore and the father is a one night stand. also you dont count a babys age from when its concieved but from when its born
#41 - Ricki - 09/10/2008 - 03:58
Humor? Logic? Philosophy?
"A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.

Where's the father?"

Missed the point:
The problem didn't ask for where or when the father did something (here in the problem). Literally, the problem just asks where the father is.

Conclusion:
So what's with the math?
#42 - bluecapz - 09/11/2008 - 05:17
Its meant to be humorous!
This logic puzzle is designed for the solver to set up the equations and do them before attempting the rest of the question. But the trick is that the math (as shown in several previous posts, I won't bother) spits out an age of -3/4 years or -9 months. It is at this point the solver should realize it takes 9 months for a pregnancy to run it's course, and further realize that the father must be with the mother. The solver should now feel silly as he has deduced the fact that two people are making love!

Don't think too hard people! It is a joke, and the humor lies in the sudden realization of something unexpected!

Definition of Humor:
An alternative (or surprising) shift in perception or answer is given that still shows relevance and can explain a situation.
#43 - Dante - 10/02/2008 - 21:23
Try hard, you'll get it.
The question is not 'how old is the baby'.......
#44 - Ioane - 10/10/2008 - 14:31
...
i didnt do the math, but assuming that everyone is correct and the answer is that the baby is -9 months old, then obviously the mother and father are making love at the time... not rocket science
#45 - Sky - 10/14/2008 - 16:45
clever
This is a good problem, but I should have worked it out before giving it to my high school class, I had a hard time explaining the answer! LOL.

I did figure it out and thought it was very cute and got a chuckle out of it.

You can pick apart any of these problems if you want to, the whole point to them is to see them in the spirit of how the question was conceived (pardon the pun).
#46 - Mattymath - 10/15/2008 - 11:58
Feeling shy
ON THE BED!!!!!!!!!!! Oh man...the bed is shaking with speed!!!!
#47 - Ali - 10/25/2008 - 07:05
umm
he is at the waiting room in the hospital :)
#48 - mothufur - 11/03/2008 - 13:33
well......
the father is also doing this logic problem...
#49 - gee - 11/04/2008 - 01:39
Well that is logical!
That sounds logical what "50" said.
#50 - Savannah - 11/04/2008 - 10:04
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