A small math problem

[Daelin]

The mother is 21 years older than her son. 6 years later, the child is 5 times younger than his mom. Where is the father? Must be solved mathematically.

Before you start yelling "this is crap, it has no solution" I suggest you atleast try and solve the system. If you're smart enough, you'll get it!

~Daelin

 

[monoVertex]

Result?

Since over 6 years the difference between the mother and her's son will be still 21, there is no way so the child could be 5 younger than his mom. So I suppose that the first mother is not the same as the second one and the father is the first child. Correct?

EDIT: nah, I'm stupid, I was thinking at something else...

 

[AceHart]

> Must be solved mathematically.

Or by guessing from the hint.
This may need a "parental advisory" though


> Correct?

No.

 

[Daelin]

> Must be solved mathematically.

Or by guessing from the hint.

Correct.

No Smith, that's not right. You'll know it when you get it.

~Daelin

 

[monoVertex]

I'm sorry, I'm a bit slower.

This may need a "parental advisory" though

Yup, it should

 

[MoonRazer]

In a grave some where. right?

 

[Lobster]

The child is the father?

 

[Daelin]

In a grave some where. right?

LOL... This is a bit twisted but if you insist. He may be! Though this is not the complete result.

Nah Lobster, it's not that simple.

~Daelin

 

[O4thK33p3r]

The mother is 21 years older than her son. 6 years later, the child is 5 times younger than his mom. Where is the father? Must be solved mathematically.

let x be the son and y be the mother. if "The mother is 21 years older than her son." then y-21 = x. from the second statement, we deduce that y-45 = 5x. if we solve the simuntaneous equation, we find out that x = -6.

which means that the equation does not work out, as the child cannot have a negative age. which leaves one conclusion: the 2 cases are unrelated, and therefore the "fatehr" has 2 sons born to 2 different women. and so, the answer to "Where is the father?" is unknown, but since he has 2 families, we can guess that he is having sex with a 3rd woman in some place.

working to those hu didn understand the crap i stated above.
y-21 = x
y-15 = 5(x+6)
y-15 = 5x+30
y-45 = 5x
------
y - x = 21
y - 5x = 45
4x = -24
x = -6

 

[AceHart]

> y-45 = 5x

Where you got that one from?

 

[O4thK33p3r]

y-15 = 5x+30
y-15-30 = 5x+30-30
y-45 = 5x

 

[AceHart]

> y-15 = 5x+30

I can see the "5x+30" part. How does "y-15" fit into the description?

 

[O4thK33p3r]

y-21 = x
//y is 21 yrs older so y-21 = x
y-15 = 5(x+6)
//6 years passed so y-21+6=-15
y-15 = 5x+30
//just multiplying out the brackets
y-45 = 5x
//removing the +30 from both sides

 

[King TonGoll]

no more math! lol this is a simple answer.

the son still hasnt been born but is in the.. is... a "sperm"

sense it dosnt say you cant find out the future. disreguard the son that is 21 years younger and think of the baby yet to be born.

 

[AceHart]

y-21 = x
//y is 21 yrs older so y-21 = x
y-15 = 5(x+6)
//6 years passed so y-21+6=-15
y-15 = 5x+30
//just multiplying out the brackets
y-45 = 5x
//removing the +30 from both sides

Hm...

You know, if now the mother is y years old. In six years, she will not be y - 15...
It will simply be y + 6.

 

[Sooda]

Hm...

You know, if now the mother is y years old. In six years, she will not be y - 15...
It will simply be y + 6.

Yes he sounds smart, but I doubt in his/ her math skills. Where he took that y-15 ?
I try to solve this one on my own too and his/ her math confuses me ( I hope that he/ she made flaw).

Here is mine solution or then wrong one...
Child is x years old.
Mother is then x+ 21.
After six years- child is 6+ x and mother is x+ 27.
so child should be after 6 years 5 times yonger ( Dunno how t ospell it )
(6+ x) + (x+ 27) = (6+ x) / 5
^ this should be the right math for answer lol... I make here progress...
To get rid of that nasty /5 I will do *5 wit both sides
(30+ 5x) + (5x + 135) = (30+ 5x)
(Answer- Coming soon )
Saw that I can cut from both sides (30+ 5x)
so it will be:
5x + 135
and X will be
5x = -135 | /5
x= -27
and once more -27/ 5 was -5.4 (years old)
Ok folks time to see if that is right... lol ( I think I have skipped math lessons)
If it has to be solved with some kind of math formula and only with that formula then you have lead us to dead end- nice task, I could not solve it then lol. Don' t let me into shop coz I don' t know math lol.
EDIT: I forgot to do the check...
-5.4+ 21= 15.6 thats sick...
after six years mom is +6.
15.6+ 6= 21.6
now kid should be 5 times yonger.
21.6/ 5= 4.32
:nuts:
Please answer

 

[AceHart]

> I hope that he/she made flaw

(S)He used the first statement to construct the second one.
And combined them yet again to find the result.

Hm... yeah. It does, of course, produce some result... but, not really the correct one.

 

[O4thK33p3r]

um...ok, sry i was wrong... :banghead:
which means i hafta redo the math =.=
after 6 years, the mother is still 21 yrs older than her son, and also 5 times as old, so..
y=x+21
y+6=5(x+6)=x+27
y+6=5x+30=x+27
/\/\
5x+30=x+27
4x+3=0
4x=-3
x=-0.75
y=20.25
/\/\
6 yrs later..
x+6=5.25
y+6=26.25
26.25/5.25=5

ok. -0.75 YEARS, aka 9 months. which means the mothers egg n the fathers sperm juz fertilised, and baby juz came into existance. which means that the fatehr is still on top of the mother making love to her.

(thx ace for pointing my mistake :banghead: )

 

[MoonRazer]

wow....ok...Daelin freakin answer the question!!!! the answers are getting farther out there each time...