The length and breadth of the floor of the room are 20 feet and 10 feet respectively. Square tiles of 2 feet length of different 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 the one-third of the remaining and blue tiles in the rest, how many blue tiles will be there? Choose the correct choice from the following answers
A) 16  B) 24  C) 32  D) 48  E) None of these
Area left after laying black tiles   = [(20 – 4) × (10 – 4)] sq. ft. = 96 sq. ft.   Area under white tiles = (1⁄3 × 96) sq. ft = 32 sq. ft.   Area under blue tiles = (96 – 32) sq. ft = 64 sq. ft.   Number of blue tiles = 64/2×2=16.   16nswer 16
<result>A</result>
The length and breadth of the floor of the room are 20 feet and 10 feet respectively. Square tiles of 2 feet length of different 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 the one-third of the remaining and blue tiles in the rest, how many blue tiles will be there?