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The length and breadth of the floor of a room are 20 feet and 10 feet respectively. Square tiles of 2 feet length of three different colours are to be laid on the floor. Black tiles are laid in the first row on all sides. If white titles are laid in the one-third of the remaining and blue tiles in the rest. how many blue tiles will be there?
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Explanation:
Area of the floor = 20 × 10 = 200 sq.ft
Area covered by black tiles
= 2 (20 + 20 + 6 + 6)
=104 sq.ft.
Remaining space
= 200 – 104 = 96 sq.ft.
Area covered by white tiles
= 1\3 × 96 = 32 sq.feet
Area covered by blue tiles
= 96 – 32 = 64 sq.feet
Area of 1 tile = (2)^2 = 4 sq.ft
No. of blue tiles = 64\4 = 16