A room of 2m 40cm long and 4m 20cm broad is to be paved with square tiles. Find the least number of square tiles required to cover the floor. Options.
A) 23 B) 25 C) 28 D) 60 E) 240
Explanation:   area of the room = 240* 420sq cm   size of largest square tile = H.C.F of 240cm and 420cm= 60cm   area of 1 tile = 60*60 sq cm   no. of tiles required = (240*420) / (60 * 60)= 
<gadget id="calculator">(240*420) / (60 * 60)</gadget>
<output>28</output>
28   Answer: 28) 28
<result>C</result>
A room of 2m 40cm long and 4m 20cm broad is to be paved with square tiles. Find the least number of square tiles required to cover the floor.