How many square tiles are needed to pave the floor of a room that is 15 m 17 cm long and 9 m 2 cm wide?
A. 814
B. 820
C. 840
D. 844
Answer:A
How many square tiles are needed to pave the floor of a room that is 15 m 17 cm long and 9 m 2 cm wide?
A. 814 B. 820 C. 840 D. 844
Explanation: H.C.F. of 1517 cm and 902 cm = 41 cm for the biggest tile.Each tile has a surface area of (41 x 41) cm2.1517 x 902/ 41 x 41 = 814 is the required number of tiles.