Quickie

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johnh
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Quickie

Post by johnh »

Spotted this in a business article, puzzle set by an economist.

Imagine you are in a waterproofed football stadium. The referee drops a single drop of water on the centre spot. One minute later he drops two spots there. Another minute later 4 drops there and so on. How long would it be before the stadium was full of water and everyone drowned?


(clue - after 45 minutes the stadium is 7% full.)


PS I know this can't be 'worked out' but requires 'best guesses'.

PPS Don't ask me how he worked it out. After all, he is an economist! :shock:
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MOT1964
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Re: Quickie

Post by MOT1964 »

I think it's 49 minutes, although I could be wrong because A Level Maths is now a distant memory for me ........ :?
Sniffer
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Re: Quickie

Post by Sniffer »

Who'd be daft enough to stay in the stadium if you could see you were going to drown?
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Selby White
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Re: Quickie

Post by Selby White »

MOT1964 wrote:I think it's 49 minutes, although I could be wrong because A Level Maths is now a distant memory for me ........ :?
Agree with that except it would be 112% full :shock:
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kk white
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Re: Quickie

Post by kk white »

Isn't it an exponential growth question? Just because you double the drops, doesnt mean you double the percentage...
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johnh
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Re: Quickie

Post by johnh »

MOT1964 wrote:I think it's 49 minutes, although I could be wrong because A Level Maths is now a distant memory for me ........ :?

49 minutes is right. Well done MOT1964. :clap:
I once played against Don Revie.
MOT1964
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Re: Quickie

Post by MOT1964 »

johnh wrote:
MOT1964 wrote:I think it's 49 minutes, although I could be wrong because A Level Maths is now a distant memory for me ........ :?

49 minutes is right. Well done MOT1964. :clap:
Cheers johnh :thumbup:
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Re: Quickie

Post by Davycc »

Ahem... can we let the water out yet, we've a game on later?
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johnh
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Re: Quickie

Post by johnh »

Davycc wrote:Ahem... can we let the water out yet, we've a game on later?
No point, your game would be rained off anyway. :D
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Re: Quickie

Post by Davycc »

johnh wrote:
Davycc wrote:Ahem... can we let the water out yet, we've a game on later?
No point, your game would be rained off anyway. :D
Fair point John, fair point :D
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