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Answer below:
Let's call the age of the mother x and the age of the son y.
We can work out two equations from what we've been told.
x = y + 21
(Which is, the mother is 21 years older than the son)
x + 6 = 5(y + 6)
(Which is, in six years, the mother will be five times older.)
So if you just substitute x..
y + 21 + 6 = 5(y + 6)
y + 27 = 5y + 30
-3 = 4y
y = -3/4
But.. what does that mean? y = -3/4? It means years.
The son is -3/4 years. There are 12 months in a year, so, he's minus 9 months old.
Where's the father? Inside the mother.
> Can you say the answer please Timmargh? Because I think I know it
What Grix said, i.e. he's Mrs. Robin's son.
Stuck at the bottom, but easily flies.
Present in sun but not in rain,
Doing no harm and feeling no pain.
What am I?
> Boringly easy:
>
> Woman: "Hello. I'm Mrs. Robinson."
> Man: "Really? So am I."
>
> How can this be?
He misheard, and the man is Mrs. Robin's son?
Woman: "Hello. I'm Mrs. Robinson."
Man: "Really? So am I."
How can this be?
Thus i would make a crap spy especially if i was made to decode a message from a puzzle such as this.
> its one of those immensely cryptic puzzles that i hate immensely.
> Totally unclear and fustrating.
>
> Partly because its maths
> Partly because it doesn't give you much to work on unless you
> understand the problem in the first place.
>
>
> I'm more a logic puzzle guy, jigsaws, rubics cubes that sort of
> thing.
..is maths emotional now? How is maths not logical? It's about constants and finding out what everything else is from what you've been given! But erm, apologies for.. I'm not even sure what, uh, putting you out of your comfort zone.. and it was more of a joke than a puzzle! And maybe your things are more visual, stuff you can actually see?
And Meka yah, it completely dawned on me once I got as far as finding the -3/4s thing meant years.. 12 months.. ohhh!
I still find it very cute.