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Question

What is the least number of squares tiles required to pave the floor of a room 15 m 17 cm long and 9 m 2 cm broad?

Options:
A .  814
B .  820
C .  840
D .  844
E .  None of these
Answer: Option A
 -   Length of largest tile = H.C.F. of 1517 cm and 902 cm = 41 cm.
 Area of each tile = (41 x 41) cm2.
 Required number of tiles =   1517 x 902   = 814. 41 x 41

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