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9 replies to this topic

#1 nikss

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Posted 20 May 2010 - 12:15 AM

did anyone post this before. maybe this is quite easy.

A frog is trap under 20 meter holes. Once it jumps, it can jump 5m but slide 4m downwards. How many times it(the frog) must jumps??
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#2 marsupialsoup

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Posted 20 May 2010 - 12:32 AM

Spoiler for Times

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#3 MikeM

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Posted 20 May 2010 - 12:51 AM

Spoiler for I may have it

did anyone post this before. maybe this is quite easy.

A frog is trap under 20 meter holes. Once it jumps, it can jump 5m but slide 4m downwards. How many times it(the frog) must jumps??


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#4 MissKitten

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Posted 20 May 2010 - 01:00 AM

Spoiler for it would take

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#5 Glycereine

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Posted 20 May 2010 - 01:02 AM

Spoiler for Times


close but
Spoiler for 1 more

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#6 RiNWAN

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Posted 20 May 2010 - 04:00 AM

Spoiler for May be

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#7 Bry68

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Posted 20 May 2010 - 11:40 AM

Spoiler for

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#8 troysccr95

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Posted 20 May 2010 - 12:40 PM

Spoiler for A different approach

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#9 donjar

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Posted 20 May 2010 - 06:24 PM

This is a variation of an old problem - one which I have been using on my maths classes for at least 20 years!
Th version I know is this:
A man is trapped 20 m down in a well. Every hour, he climbs up 3 m, but then falls back 2 m. How many hours will it take him to get out of the well?

The idea is exactly the same as this posted problem. There are a number of similar problems which are well-known.

Spoiler for

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#10 DeeGee

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Posted 20 May 2010 - 06:24 PM

Spoiler for A different approach


Good out of the "hole" thinking!
Welcome nikss to the den. Dont get surprised by such out of the box answers, you'll find plenty of it here! If I may quote Bonanova which went something like this - some people here are living so far out of the box that if you ask them to think within the box, they need to first find the box
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