What is the least number of square tiles required to pave the floor of a room 11 m 50cm long and 1m 50 cm broad?  Answers.
A) 724 B) 804 C) 69 D) 844 E) none

Rationale: "solution length of largest tile = h . c . f . of 1150 cm & 150 cm = 50 cm . area of each tile = ( 50 x 50 ) cm 2 ∴ required number of tiles = [ 1150 x 150 / 50 x 50 ] = 69 . answer c"
Answer: C