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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.
> 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?
Stuck at the bottom, but easily flies.
Present in sun but not in rain,
Doing no harm and feeling no pain.
What am I?
> Can you say the answer please Timmargh? Because I think I know it
What Grix said, i.e. he's Mrs. Robin's son.