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> OT: Math problem...
Jeroen
post Jan 31 2005, 05:30 PM
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Ok, here's a nice one...

A mother is 21 years older than her daughter.
In 6 years, this mother will be 5 times as old as her daughter

The question is: Where is the dad???

Intermezzo:
Some people get confused and will start asking WHO the dad is.
I don't know the question to that answer either. Only the mother can be 100% sure on that.
And no math can answer that questiong.

Some people may be confused by the sudden "appearance" of the dad and because of that, forget about the math.
Still, the question can be answered by simple math...

(scroll down for the solution)

































Set the mother's age to X
Set the daughter's age to Y

"The mother is 21 years older than her daughter" will then give this equation:
X = Y + 21

and "in 6 years, the mother will be 5 times as old as her daughter" will make:
X + 6 = 5(Y + 6)

We now have 2 equations with 2 unknowns, so we should be able to solve it:

In the second equation, substitute the value of X (= Y+21).
This will give:

Y + 21 + 6 = 5(Y + 6)
=>
Y + 27 = 5Y + 30
=>
Y - 5Y = 30 - 27
=>
-4Y = 3
=>
4Y = -3
=>
Y = 0.75

And there's the answer...!

The daughther is at this moment -0.75 years old, or -9 months
So the dad is on top of the mother right know (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif)
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Aaron Cox
post Feb 1 2005, 09:42 AM
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QUOTE (Special_K @ Feb 1 2005, 12:15 AM)
Okay,

Always old, sometimes new
Never sad, sometimes blue
Never empty, sometimes full
Never pushes, always pulls
What is it?

I know, not a math question but..... (IMG:http://www.914world.com/bbs2/html/emoticons/bootyshake.gif)

dude- whats the answer?
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Posts in this topic
Jeroen   OT: Math problem...   Jan 31 2005, 05:30 PM
sanman   Then there is the posibility she is on top so your...   Jan 31 2005, 05:44 PM
tat2dphreak     Jan 31 2005, 06:15 PM
Carlitos Way   So then the correct answer is: INSIDE the mom...   Jan 31 2005, 06:15 PM
Aaron Cox   ill take that to math class htt...   Jan 31 2005, 06:19 PM
bd1308   http://www.914world.com/bbs2/ht...   Jan 31 2005, 06:21 PM
SLITS   You're all wrong...if the child is 9 months ol...   Jan 31 2005, 06:21 PM
SpecialK   Old mathimeticians never die, they just lose some ...   Jan 31 2005, 06:26 PM
bondo     Jan 31 2005, 06:27 PM
bondo   http://www.914world.com/bbs2/html/e...   Jan 31 2005, 07:49 PM
MattR   http://www.914world.com/bbs2/...   Jan 31 2005, 09:02 PM
Jenny     Feb 1 2005, 01:38 AM
GWN7     Feb 1 2005, 05:18 AM
sgomes   ...and that was the one incorrect word. 'Plus...   Feb 1 2005, 08:52 AM
Aaron Cox   ...   Feb 1 2005, 09:42 AM
larryp   The moon!   Feb 1 2005, 11:06 AM
Jenny   I figured out the moon riddle. The bellboy one I g...   Feb 1 2005, 11:37 AM
SpecialK   Yep....the moon. The ht...   Feb 1 2005, 01:02 PM
Toast   Things to do at Walmart 15 Things to do at Walma...   Feb 1 2005, 01:56 PM
SpecialK   http://www.914world.com/bbs2/ht...   Feb 1 2005, 02:01 PM
Toast   http://www.914world.com/bb...   Feb 1 2005, 02:04 PM
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