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Giant Jelly


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12 replies to this topic

#1 mmiguel

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Posted 04 September 2012 - 02:26 AM

A giant jelly weighs 100 pounds and is 99% water by weight.
It is set out in the sun and water evaporates until it is 98% water by weight.

How much does the jelly now weigh?
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#2 vistaptb

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Posted 04 September 2012 - 02:50 AM

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#3 phil1882

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Posted 04 September 2012 - 02:55 AM

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#4 inert-

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Posted 04 September 2012 - 03:31 AM

It would seem that the answer 50 given by vistaptb is exactly correct, not approximately correct. Because there is exactly one pound of non-water then this with exactly 49 pounds of water gives 50 pounds total with 98 percent water. If x is the total weight then the correct equation is (x-1)/x = 0.98
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#5 mmiguel

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Posted 04 September 2012 - 04:53 AM

Spoiler for You're telling me

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#6 Potok

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Posted 04 September 2012 - 12:33 PM

That will be correct, right ?
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#7 Rob_Gandy

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Posted 04 September 2012 - 10:00 PM

Spoiler for You're telling me

I know right? It seems quite odd and slightly unbelievable, but, as I'm sure you know, since the water makes up such a large portion of the total mass 1% less is a significant change.
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#8 mmiguel

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Posted 05 September 2012 - 04:46 AM

That will be correct, right ?


Yup!
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#9 bhramarraj

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Posted 12 September 2012 - 02:08 PM

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#10 ~andy~

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Posted 22 October 2012 - 08:12 PM

It weighs 99 pounds, the jelly doesn't evaporate? Maybe?
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