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Johnny Ball's Math's Joke
Posted: Mon Dec 12, 2011 9:27 pm
by pheasantchick
I heard an interview with Johnny Ball on the radio and thought I'd share this maths question with you.
I have two coins. They add up to 15p. One of them is not a 10p piece. What are the two coins?
I shall post the answer tomorrow.
I was pleased to say that my DS got it almost straight away. I couldn't work it out.
Re: Johnny Ball's Math's Joke
Posted: Mon Dec 12, 2011 9:32 pm
by hermanmunster
I suppose it is something to do with
one of them not being a 10p piece.... doesn't say the other one can't be a10p!
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 12:01 am
by Looking for help
I also heard it and found it absolutely awful, nothing to do with any kind of reasoning or mathematical ability whatsoever.
Just a joke....
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 5:50 pm
by Minesatea
Actually a similar question to this was on a paper of questions my DD was given at school in critical thinking!
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 8:41 pm
by pheasantchick
HM you are too quick and too clever, and correct. The other coin is a 10p and the first coin is a 5p pence piece.
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 8:54 pm
by yoyo123
actually I think it's fairly good and makes you examine the evidence..quite mathematical
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 8:58 pm
by Guest55
Why is 6 afraid of 7?
Because 7 8 9 ....
Why did the mathematical tree fall over?
Because it had no real roots ...
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 9:05 pm
by yoyo123
Guest55 wrote:Why is 6 afraid of 7?
Because 7 8 9 ....
Why did the mathematical tree fall over?
Because it had no real roots ...
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 9:16 pm
by Guest55
Why did the chicken cross the mobius strip?
To get to the other ... oh
Did you hear about the maths teacher they arrested yesterday?
No
He was carrying a protractor... so they arrested him for possession of an instrument of maths construction.
Re: Johnny Ball's Math's Joke
Posted: Tue Dec 13, 2011 10:07 pm
by Looking for help
yoyo123 wrote:actually I think it's fairly good and makes you examine the evidence..quite mathematical
I think the answer was that the other coin was 10p , pointless, although there was some stuff about 2 and a half bob and a sixpence but that's only any use if you can do old money (I'm old and I can't ) - hence I prefer the 7 8 9 joke and similar ones