The length and breadth of the floor of the room are 20 feet and 10 feet respectively square tiles of 2 feet length of difference colours are to be laid on the floor . Black tiles are laid in the first row on all sides. If white tiles are laid in he one-third of the remaining and blue tiles in the rest . how many blue tiles will be here ?
Area left after laying black tiles = [ (20 - 4) x (10 - 4)] sq ft. = 96 sq.ft.
Area under white tiles = `(1/3 xx 96)` sq.ft. = 32 sq.ft.
Area under blue tiles = (96 - 32) sq.ft. = 64 sq.ft.
Number of blue tiles = `(64)/(2 xx 2)` = 16 .
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