http://www.xing.com/net/mathe/ Latest articles in XING group "Mathematics/Mathematik" en-en Copyright XING AG 21 Sep 2009 10:30:08 GMT 21 Sep 2009 10:30:08 GMT en-support@xing.com en-support@xing.com epublica http://www.xing.com/img/xing/xing_logo_small.gif http://www.xing.com/net/mathe/ 90 45 http://www.xing.com/app/forum?op=showarticles&id=1997688&articleid=24412173#24412173 Let me ask some brain teasers from Emrehan Halıcı 's marathon. These are good teasers that can be brain storm . 1) You are in a camp with 90 liters of water. You want to transport as much water as possible to a second campsite, which is 20 kilometers away. • You have sufficient number of jerrycans with various capacities. You can leave these jerrycans on your way, and take them back later. • You can carry at most 30 liters of water at a time. • You need to consume 2 liters of water per ... Sedat ESER <en-support@xing.com> http://www.xing.com/app/forum?op=showarticles&id=1997688&articleid=24412173#24412173 Wed, 16 Sep 2009 01:15:18 GMT http://www.xing.com/app/forum?op=showarticles&id=24406425&articleid=24412160#24412160 Hi , Thank you for your quick help . Sedat ESER <en-support@xing.com> http://www.xing.com/app/forum?op=showarticles&id=24406425&articleid=24412160#24412160 Wed, 16 Sep 2009 01:07:17 GMT http://www.xing.com/app/forum?op=showarticles&id=24406425&articleid=24410433#24410433 Hi, your question is known as "disk covering" problem. The answer for 2cm/1cm circles is 7. See: http://mathworld.wolfram.com/DiskCoveringProblem.html and: http://www2.stetson.edu/~efriedma/circovcir/ Greetings! Axel Kemper Dr. Axel Kemper <en-support@xing.com> http://www.xing.com/app/forum?op=showarticles&id=24406425&articleid=24410433#24410433 Tue, 15 Sep 2009 21:17:52 GMT http://www.xing.com/app/forum?op=showarticles&id=24406425&articleid=24406425#24406425 Hi , I have something to ask you . have 2 different size circles , The radius of a circle is 2 cm , others 1 cm . At least how many circles of 1 cm radius ones cover(mean totally closed) to 2 cm radius one ? is there anyone draw it for me? Sedat ESER <en-support@xing.com> http://www.xing.com/app/forum?op=showarticles&id=24406425&articleid=24406425#24406425 Tue, 15 Sep 2009 18:47:26 GMT