What is the least number of squares tiles required to pave the floor of a room

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

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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