A room 3 m 21 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.  Choose the correct choice:  A) 27636  B) 27640  C) 27647  D) 27713  E) 27675
Explanation:   Area of the room = (321 x 777) cm2.   Size of largest square tile = H.C.F. of 321 cm and 777 cm = 3 cm.   Area of 1 tile = (3 x 3) cm2.   Number of tiles required =(321×777)/(3×3)=27713   Answer: Option 27713
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A room 3 m 21 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.