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Area - General Aptitude

Q1:

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?

A 814

B 820

C 840

D 844

ANS:A - 814

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