Riddle?

Monday, 17 November 2008, 20:19 | Category : Uncategorized
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If a bridge can take 150kg per square metre, and we gather up a whole lot of people, pait them up so there are people piggybacking each other to make 150kg piggybacked people (e.g a 80kilo guy piggybacking a 70 kilo girl)… can we make the bridge collapse??

Or, if we add just one bike…