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 Post subject: More Help Please
PostPosted: Thu Feb 15, 2007 9:50 am 
When tiling the square wall of my kitchen, I use red and blue square tiles
all of the same size. In the pattern all the tiles are red apart from those on the two diagonals which are blue. If I use 37 blue tiles, how many red tiles are needed?


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 Post subject:
PostPosted: Thu Feb 15, 2007 11:31 am 
Its square
the blue tiles are in the diagonals
there are an odd number of blue tiles so the center tile is shared.

the number of tiles in a diagonal is the same as the number of tiles in an edge.


so (37 +1)/2 will give us the length of an edge (+1 for shared tile)

so length of edge is 19 tiles

19x19= 361 total tiles

red tiles = 361-37 = 324 tiles


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 Post subject:
PostPosted: Thu Feb 15, 2007 11:36 am 
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Joined: Tue Dec 13, 2005 12:49 pm
Posts: 1647
Location: berkshire
Possibly...
Each diagonal line (set in a cross) would be 19 squares therefore I would assume wall would be 19 x19 = 361 tiles. 361 - 27 (blue tiles) = 324.
(havent double checked the figures.) :?


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