A room 11 m 47 cm long and 7m 77 cm broad is to be paved with square tiles. Find the least number of square tiles required to cover the floor. Answers:
A) 636 B) 640 C) 647 D) 651 E) 675

Rationale: explanation : area of the room = ( 1147 x 777 ) cm 2 . size of largest square tile = h . c . f . of 1147 cm and 777 cm = 37 cm . area of 1 tile = ( 37 x 37 ) cm 2 . number of tiles required = ( 1147 × 777 ) / ( 37 × 37 ) = 651 answer : option d
Answer: D