Question

What is the least number of square 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
• E. 894

Answer 1

The correct option is A

814

Length of largest tile = H.C.F. of 1517 cm and 902 cm = 41 cm. Area of each tile = (41 $\times$ 41) cm${}^2$ $\therefore$ Required number of tiles = $\left(\frac{1517\times 902}{41\times 41}\right)=814$