Please do **NOT** post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

Right now a mother is 21 years older than her child, but in 6 years her child will be 5 times younger than her. Where is the father?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called **PUZZLED** and is available for the **Kindle **(UK here and USA here) and on the **iBookstore** (UK here in the USA here). You can try 101 of the puzzles for free here.

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Ooh Matron!

2 minutes (to solve the puzzle, that is)

Done.

Immediately got it, but I was really put off by the term ‘5 times younger than’. That is a nonsense.

Great to hear that you have “come” up trumps again, your Lordship.

Perhaps you now have time to “spill the beans” regarding your two answers to Richard’s 6/12/13 puzzle?

On top of the mother!

Don’t be shy, your Lordship.

We are all ears.

Hmm, interesting

I have “come” to the right answer in 3 minutes…

Are you always so quick? 😉

Hmmmp, interesting!

Got this one in a flash unlike some.

What does 5 times younger mean? If one fifth Mum’s age I have a reasonable answer. If it means the child is 5 times the child’s age younger the answer is not clear.

Agreed – “5 times younger” is not arithmetically clear.

Similarly, is “three times bigger” the same as “four times as big”?

I take it to mean that m+6 = 5c, but that makes the kid out to be several years old, which doesn’t seem to agree with what commenters are implying.

@Bert Remember that both of them age.

Ah, yes. Silly me.

Did the algebra. Got the result. 1 minute.

Is that ‘Where is the father?’ relative to the mother? If so, can’t be ascertained.

I demand a DNA test before I incriminate myself!

Happy new year all

Got it! 5 mins cos I have just woken up….. Saucy!

Working of course. Unless you’re referring to Broken Britain.

Easy: The Daily Mail says he’s on Jeremy Kyle 😉

* Blush! *

(2 minutes)

Guessed it immediately, but about 2.5 mins to confirm using Hard Sums.

Same here.

Oh no.

I guess they didn’t use one.

Where is the father? I couldn’t conceive…

took a few minutes, but I think I got it

Well if the mother set off from Leeds at 10 o’clock, on a train heading south at 82 mph, then the father….mmmh

1 min (um!)

I’m embarrassed, and not just for making many errors in the fancy math.

don’t determined

Oh how I wish the intended answer were true. Unfortunately, it isn’t – because there is a flaw in the thinking 🙂

MikeI’m not sure how religious richard is, but to most bible thumpers, their father is always in (as in our father who art inheaven, but perhaps I should focus more on the sane answers

Please explain on Monday, Mike

Think I ve got it,took about an hour…

Jeje it’s fun

A variant in this puzzle: http://www.sharenator.com/Memebase_79/memes_where_was_prince_william_in_indiana-213368.html

It took me about 5 minutes to work out that “5 times younger than” was probably supposed to mean “a fifth of the ago of”, and then about 20 seconds to work out the answer.

Very cute. Can use basic algebra to solve, but if you think about it, there can only be two possible answers with the given info.

Hahahahah XD loved the puzzle

Haha! 2 min.

Doh! About 2 minutes to “get” it.

Took me a day. Got it thanks to a hint in a comment above.

Seminal puzzle!

Couple of minutes. But I’m not saying to do what.

Embarrassingly long for a mathematical physics graduate.

I probably spent too much time studying maths and physics in my youth to make much sense of the answer.

Terrible puzzle, there can be no right answer if you use any reasonable definition of the word child

I don’t think you have much grasp on what’s reasonable and what isn’t.

This is weird. What in the world does “five times younger” even mean? how can I do a puzzle with undefined terms?

Stephen, I got the first letter and every an individual after EXCEPT Margaret Cho’s. Can you remedy that, please?