mmiguel Posted September 4, 2012 Report Share Posted September 4, 2012 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? Quote Link to comment Share on other sites More sharing options...
0 vistaptb Posted September 4, 2012 Report Share Posted September 4, 2012 50 pounds Quote Link to comment Share on other sites More sharing options...
0 phil1882 Posted September 4, 2012 Report Share Posted September 4, 2012 roughly 50 pounds. more precisely, x/(x+1) = .98 Quote Link to comment Share on other sites More sharing options...
0 inert- Posted September 4, 2012 Report Share Posted September 4, 2012 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 Quote Link to comment Share on other sites More sharing options...
0 mmiguel Posted September 4, 2012 Author Report Share Posted September 4, 2012 That taking away one measly percentage point in the water proportion corresponds to losing 50 pounds of water? Quote Link to comment Share on other sites More sharing options...
0 Potok Posted September 4, 2012 Report Share Posted September 4, 2012 That will be correct, right ? Quote Link to comment Share on other sites More sharing options...
0 Rob_Gandy Posted September 4, 2012 Report Share Posted September 4, 2012 That taking away one measly percentage point in the water proportion corresponds to losing 50 pounds of water? 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. Quote Link to comment Share on other sites More sharing options...
0 mmiguel Posted September 5, 2012 Author Report Share Posted September 5, 2012 That will be correct, right ? Yup! Quote Link to comment Share on other sites More sharing options...
0 bhramarraj Posted September 12, 2012 Report Share Posted September 12, 2012 There was 99 pounds of water in 100 pounds Jelly. Say X pound giant jelly is left after evaporation, which now contain 98%water. Balance 2% is jelly which will remain to be 1 pound as originally it was. So 2X/100 = 1 OR X = 50 Pounds. Therefore Giant gelly now weighs 50 Pounds. Quote Link to comment Share on other sites More sharing options...
0 ~andy~ Posted October 22, 2012 Report Share Posted October 22, 2012 It weighs 99 pounds, the jelly doesn't evaporate? Maybe? Quote Link to comment Share on other sites More sharing options...
0 Krizhelle Sheen Posted October 23, 2012 Report Share Posted October 23, 2012 when 100 pounds of jelly has 99% of water, and the water decreased into 98%, then maybe the jelly will weigh 99 pounds. Quote Link to comment Share on other sites More sharing options...
0 hhh3 Posted October 25, 2012 Report Share Posted October 25, 2012 krizhelle.. wat??!! and by the way.... very good puzzle mmiguel... seemed very simple at first ... but took me half an hour and 2 pages full of writing equations with "x" in it.. Quote Link to comment Share on other sites More sharing options...
0 ~andy~ Posted October 25, 2012 Report Share Posted October 25, 2012 Yes, i get it nowslightly under 50 poundsThe jelly doesn't evaporate Quote Link to comment Share on other sites More sharing options...
Question
mmiguel
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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