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Throwing needles (Posted on 2005-01-19) Difficulty: 3 of 5
If I throw 1000 10-centimeter-long needles on to a tiled floor, where each tile is a 10 cm x 30 cm rectangle, approximately how many needles will end up lying across a crack?

You may assume that the widths of both the needles and the cracks are negligible.

See The Solution Submitted by Sam    
Rating: 3.6667 (3 votes)

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Answer Comment 9 of 9 |
Approximately 743 needles will end up lying across a crack.

Edited on April 14, 2008, 4:32 pm
  Posted by K Sengupta on 2008-04-14 16:31:57

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